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2600 Outputs.
gurriesm
James,
If I had to replace my outputs on the 2600, I would have bought the following: 2SD555 250V, 10A, 200W, Ft=15MHz 2SB600 200V, 10A, 200W, Ft=14MHz Would you recommend these for the outputs? By the way, Mouser has them at roughly $18/ea with a minimum order of 10. So If I wanted to use these, it would be a $360 investment. Something to think about for those interested in fixing the BIG amps. Best Regards, Mark Gurries ---------------------------------------------------------- Battery Charging and Power Systems Application Engineer Linear Technology,1630 McCarthy Blvd, Milpitas, CA, 95035 WRK(408) 954-8400 x3864 Email: gurriesm@... FAX(408) 428-9413 WebSite: ---------------------------------------------------------- Work & Hobby Related Website Info: Smart Battery Charging Systems: Model Railroad Club: ---------------------------------------------------------- |
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Hold the horses
sstinc:"First sstinc:Last"
To all my friends,
Please disregard my previous e-mail concerning my intended move. Erase all of the information that was provided. The owners of the complex that I intended to move into turned out to be extremely tenant UNfriendly and practically Gestapo-ish. Therefore, I will not be moving to that place. I am now back to looking again and currently my information remains as before. Sorry for all of the confusion but things have to be right with any kind of moving situation. Shortly, I hope to find an acceptable place. James Bongiorno |
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Re: P500
sstinc:"First sstinc:Last"
Dear Manuel,
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The following things may be the cause of your troubles. Firstly, the cutting out probably is due to an offset that may have developed and the relay circuit is sensing this offset (DC). Also, there may be something definitely wrong with the circuit which may be causing an asymmetry during amplification which would surely produce the "effect" of dc at the output which again would trigger the relay. As far as the hum is concerned, I suspect that since you now have TWO amps in the system, you may have both of them grounded through the 3rd wire ac plug. This is definitely a no-no with multiple amps. Check this and if so, use 3 to 2 wire plugs (available in almost every hardware store) to break the ground connections. Also, make sure that NOTHING else is common grounded through the ac lines which can cause ground loops. Finally, as I've said many times, amps are like cars and refridgerators:they get old and tired and need to be refurbished to bring them back to like new condition. If you are interested, please contact me directly at my e-mail which is <jamesbongiorno@.... I will then supply you with my schedule. James Bongiorno mmyrtak@... wrote: From: mmyrtak@... |
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P500
I own a SAE system that includes the following items - 8000, 2800,
2100L, 2200 and P500. I am also using a DBX 223 electronic crossover. Before adding the crossover I was using the P500 as my only amp. At that time the right channel was cutting in and out. After adding the crossover the amp does not cut out however I have a low hum from the speakers. Does anyone know what could be causing the hum? I have checked all of the connections and they seem to be fine. Does anyone have suggestions? Should I have the units serviced? Any help would be appreciated... Manuel |
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Moving--finally
sstinc:"First sstinc:Last"
To all my friends,
I finally located a place. Please record my phone number which will become effective on 3/15/00. It will be (805) 658-2444. It will be UNlisted, so don't lose it. My new address will be 866 Empire Ave., Ventura, Ca. 93003. To those of you who may be contemplating sending in units for mods, my previous address will REMAIN the same until the end of March giving me enough time to make my new arrangements with UPS. My two e-mails will REMAIN the same as follows: <sstinc@...> and <jamesbongiorno@... James |
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Re: more 2600 and 2100L stuff.
sstinc:"First sstinc:Last"
Dear Mark,
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Aha. You have uncovered the problem. Those transistors (Japanese ones) are absolutely unacceptable as second stage volage amplifiers. My design calls for a MINIMUM of 50MHz of Ft, preferably higher. The transit time of those devices is so slow as to make the compensation almost totally ineffective ie: oscillatory. The amount of "comp" that would be needed to stabilize those devices would be so large that the power bandwidth would go right out the window. As I mentioned earlier, I strongly suggest that you use the previously mentioned Toshiba devices. James Bongiorno gurriesm wrote: From: gurriesm <gurriesm@...>From: gurriesm <gurriesm@...>First sstinc:Last sstinc: wrote:Ok here is the info from my 1982 EIAJ Japanese Transistor Manual.You haven't mentioned what transistors were put in there as |
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Re: more 2600 and 2100L stuff.
gurriesm
From: gurriesm <gurriesm@...>First sstinc:Last sstinc: wrote: Ok here is the info from my 1982 EIAJ Japanese Transistor Manual.You haven't mentioned what transistors were put in there as According to the manual, these Transistors are to be consisdered complimentary pairs. Most of the manual is in Japanese, so I cannot read all the spec titles. PNP 2SB630 Vceo=200V, Vebo=5V, Ic=2A, Pd=25W, hfe=80, Ft=4MHz, Cob=65, TO-220 NPN 2SD610 Vceo=250V, Vebo=5V, Ic=2A, Pd=25W, hfe=80, Ft=5MHz, Cob=45, TO-220 Do you know the original specs of the SAE part numbers? PNP S1376 NPN S1375 Best Regards, Mark Gurries ---------------------------------------------------------- Battery Charging and Power Systems Application Engineer Linear Technology,1630 McCarthy Blvd, Milpitas, CA, 95035 WRK(408) 954-8400 x3864 Email: gurriesm@... FAX(408) 428-9413 WebSite: ---------------------------------------------------------- Work & Hobby Related Website Info: Smart Battery Charging Systems: Model Railroad Club: ---------------------------------------------------------- |
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Re: more 2600 and 2100L stuff.
gurriesm
First sstinc:Last sstinc: wrote:
From: sstinc:"First sstinc:Last" <jamesbongiorno@...>for a single opamp version of the 823. I wish they would wake up.I have determined that the original Op-Amp is the NE5534 that is still available from Phillips and TI. The oscillation thatgood high frequency polyester of .1ufd @ 200V.I will just go and replace them on the Daughter Card. I have the correct replacement parts. But have you ever seen the "white" polyester bypass caps go before? Do you think I need to replace the ones on the Power Board near the TO-3's? I still think that the compensationI hopping that putting the original transistors I get will allow me to avoid this all together. You haven't mentioned what transistors were put in there asI do not have the exact part numbers with me now. They are TO-220 parts like 2SB675 or something like that for the PNP and I do not remember the NPN part number. But that is a guess from memory. Wait till I get home to dig up the numbers. I have a Japanese Transistor Manual that tells me the specs. I know that they are rated at 200V. No quite the 250 Vceo rating you would like to see. It is really too bad that Motoroa no longerThat one of the things I did to the amp. Cleaned up all the connector contacts removing any oxidation build up, resoldered all solder joints that looked bad especially on the driver board where the resistors get too hot and burn the PCB. (I fixed that by adding two mini 1.25" 12V computer fans the blow right on the resistors to prevent the board from re-burning.) I defluxed every board scrubbing them clean with a tooth brush. I cleaned out all the burned Carbon PCB spots where some resistors had burned on the daughter card. Replaced all the AL caps on the Daughter Card but left all the white polyester cap's alone. The TO-3 outputs are the Japanese version with a very THICK steel base. I pulled all the TO-3 and TO-66 transistors on the driver board and replaced the old silicon grease with top of the line heavy duty SilPads. Replaced all the heatsink to heatsink silicon grease with new grease. Replaced the thermal grease of the thermal sensing transistors and made sure there was plenty of pressure on them onto the heat sink. Thermal tracking looks good. I mean I totally stripped the amp apart removing EVERY single screw cleaning or removing rust or corrosion. That includes the transformer case too. Some screws had signs of rust despite the use Stainless Steel. Replaced the missing lock washers on on the electrical screw connections. Replaced the Fast-On Spade Lugs on all the cables the plug into the Bridge Rectifier or the Fuse or Main filter cap assemblies. Re-glued the front plastic bezels and recalibrated the front meters after I fixed the circuit. I could not calibrate the meters with the given adjustment range. Cleaned up every scratch. The amp looks brand new!!! I had to do all this. I could not trust the amp given the history. When I power up the amp for the first time, the power transformer CT winding screw connection was loose and sparking!! This amp was abused by a band and repaired by an idiot who connected the two black ground leads that go the the power supply ground to Chassis ground!! That put the speakers and series and made the amp sound terrible the original owner. I wonder why!!! James theFrom: gurriesm <gurriesm@...> theplanet. Period. No you can't use it for very low noise applications where 1028 or the 1122 would work. Other than that, nothing touches it.James, you told me about this Op-amp on the phone when I first talked to Best Regards, Mark Gurries ---------------------------------------------------------- Battery Charging and Power Systems Application Engineer Linear Technology,1630 McCarthy Blvd, Milpitas, CA, 95035 WRK(408) 954-8400 x3864 Email: gurriesm@... FAX(408) 428-9413 WebSite: ---------------------------------------------------------- Work & Hobby Related Website Info: Smart Battery Charging Systems: Model Railroad Club: ---------------------------------------------------------- |
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Re: more 2600 and 2100L stuff.
sstinc:"First sstinc:Last"
Dear Mark,
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UNfortunately, the brilliant geniuses at ADI haven't yet realized the need for a single opamp version of the 823. I wish they would wake up. The oscillation that you mention might also be faulty by-passing on the supply rails. You need a good high frequency polyester of .1ufd @ 200V. I still think that the compensation needs to be redone. You haven't mentioned what transistors were put in there as 2nd stage voltage amps. What are they? It is really too bad that Motoroa no longer makes the devices that I originally used as they were supherb. There is also a possibility that you might have a bad ground somewhere. You need to check this. James gurriesm wrote: From: gurriesm <gurriesm@...> |
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Re: more 2600 and 2100L stuff.
gurriesm
First sstinc:Last sstinc: wrote:
From: sstinc:"First sstinc:Last" <jamesbongiorno@...>I think you mean me, Mr Gurries. I would like to repeat that if you have an oscillation problem it is justThat what I thought, but until everything is set up right, I could not be sure. The oscillation starts on the downward slope of the waveform after comming out of clipping. It not continous in its duration for it quits has it approuches the zero crossing point. It looks like a high frequency burst tone supperimposed on the test sine wave. This channel has substituted transistors that some else put in when the Amp was in the shop some year ago before I bought it. The amp history was that it was used by a Rock and Roll band who from my diagnosis burned it out with RF. Both 2.2 Ohm resistors on both channels that are is part of the RL filter ont he output were burned off the board!! My current plan is to get some correct transistors and I think I got a way to do that. Regarding the op-amp. I don't mean to offend the Linear Tech crew but youJames, you told me about this Op-amp on the phone when I first talked to you and I would normally aggree with you. BUT the problem with the AD823 is that it is a DUAL. The socket is for a single. I in fact have already purchased a AD823 and considered how I would mount it in the socket. It did not look pretty so I decided to look for alternative pin for pin in my own backyard so to speak. Do you happen to know if the AD823 comes in a single version? I will have to dig around AD website to see. Best Regards, Mark Gurries ---------------------------------------------------------- Battery Charging and Power Systems Application Engineer Linear Technology,1630 McCarthy Blvd, Milpitas, CA, 95035 WRK(408) 954-8400 x3864 Email: gurriesm@... FAX(408) 428-9413 WebSite: ---------------------------------------------------------- Work & Hobby Related Website Info: Smart Battery Charging Systems: Model Railroad Club: ---------------------------------------------------------- |
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Re: more 2600 and 2100L stuff.
gurriesm
First sstinc:Last sstinc: wrote:
From: sstinc:"First sstinc:Last" <jamesbongiorno@...>I think you mean me, Mr Gurries. I would like to repeat that if you have an oscillation problem it is justThat what I thought, but until everything is set up right, I could not be sure. The oscillation starts on the downward slope of the waveform after comming out of clipping. It not continous in its duration for it quits has it approuches the zero crossing point. It looks like a high frequency burst tone supperimposed on the test sine wave. This channel has substituted transistors that some else put in when the Amp was in the shop some year ago before I bought it. The amp history was that it was used by a Rock and Roll band who from my diagnosis burned it out with RF. Both 2.2 Ohm resistors on both channels that are is part of the RL filter ont he output were burned off the board!! My current plan is to get some correct transistors and I think I got a way to do that. Regarding the op-amp. I don't mean to offend the Linear Tech crew but youJames, you told me about this Op-amp on the phone when I first talked to you and I would normally aggree with you. BUT the problem with the AD823 is that it is a DUAL. The socket is for a single. I in fact have already purchased a AD823 and considered how I would mount it in the socket. It did not look pretty so I decided to look for alternative pin for pin in my own backyard so to speak. Do you happen to know if the AD823 comes in a single version? I will have to dig around AD website to see. Best Regards, Mark Gurries ---------------------------------------------------------- Battery Charging and Power Systems Application Engineer Linear Technology,1630 McCarthy Blvd, Milpitas, CA, 95035 WRK(408) 954-8400 x3864 Email: gurriesm@... FAX(408) 428-9413 WebSite: ---------------------------------------------------------- Work & Hobby Related Website Info: Smart Battery Charging Systems: Model Railroad Club: ---------------------------------------------------------- |
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Re: more 2600 and 2100L stuff.
gurriesm
First sstinc:Last sstinc: wrote:
From: sstinc:"First sstinc:Last" <jamesbongiorno@...>I think you mean me, Mr Gurries. I would like to repeat that if you have an oscillation problem it is justThat what I thought, but until everything is set up right, I could not be sure. The oscillation starts on the downward slope of the waveform after comming out of clipping. It not continous in its duration for it quits has it approuches the zero crossing point. It looks like a high frequency burst tone supperimposed on the test sine wave. This channel has substituted transistors that some else put in when the Amp was in the shop some year ago before I bought it. The amp history was that it was used by a Rock and Roll band who from my diagnosis burned it out with RF. Both 2.2 Ohm resistors on both channels that are is part of the RL filter ont he output were burned off the board!! My current plan is to get some correct transistors and I think I got a way to do that. Regarding the op-amp. I don't mean to offend the Linear Tech crew but youJames, you told me about this Op-amp on the phone when I first talked to you and I would normally aggree with you. BUT the problem with the AD823 is that it is a DUAL. The socket is for a single. I in fact have already purchased a AD823 and considered how I would mount it in the socket. It did not look pretty so I decided to look for alternative pin for pin in my own backyard so to speak. Do you happen to know if the AD823 comes in a single version? I will have to dig around AD website to see. Best Regards, Mark Gurries ---------------------------------------------------------- Battery Charging and Power Systems Application Engineer Linear Technology,1630 McCarthy Blvd, Milpitas, CA, 95035 WRK(408) 954-8400 x3864 Email: gurriesm@... FAX(408) 428-9413 WebSite: ---------------------------------------------------------- Work & Hobby Related Website Info: Smart Battery Charging Systems: Model Railroad Club: ---------------------------------------------------------- |
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Re: more 2600 and 2100L stuff.
gurriesm
First sstinc:Last sstinc: wrote:
From: sstinc:"First sstinc:Last" <jamesbongiorno@...>I think you mean me, Mr Gurries. I would like to repeat that if you have an oscillation problem it is justThat what I thought, but until everything is set up right, I could not be sure. The oscillation starts on the downward slope of the waveform after comming out of clipping. It not continous in its duration for it quits has it approuches the zero crossing point. It looks like a high frequency burst tone supperimposed on the test sine wave. This channel has substituted transistors that some else put in when the Amp was in the shop some year ago before I bought it. The amp history was that it was used by a Rock and Roll band who from my diagnosis burned it out with RF. Both 2.2 Ohm resistors on both channels that are is part of the RL filter ont he output were burned off the board!! My current plan is to get some correct transistors and I think I got a way to do that. Regarding the op-amp. I don't mean to offend the Linear Tech crew but youJames, you told me about this Op-amp on the phone when I first talked to you and I would normally aggree with you. BUT the problem with the AD823 is that it is a DUAL. The socket is for a single. I in fact have already purchased a AD823 and considered how I would mount it in the socket. It did not look pretty so I decided to look for alternative pin for pin in my own backyard so to speak. Do you happen to know if the AD823 comes in a single version? I will have to dig around AD website to see. Best Regards, Mark Gurries ---------------------------------------------------------- Battery Charging and Power Systems Application Engineer Linear Technology,1630 McCarthy Blvd, Milpitas, CA, 95035 WRK(408) 954-8400 x3864 Email: gurriesm@... FAX(408) 428-9413 WebSite: ---------------------------------------------------------- Work & Hobby Related Website Info: Smart Battery Charging Systems: Model Railroad Club: ---------------------------------------------------------- |
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Re: more 2600 and 2100L stuff.
sstinc:"First sstinc:Last"
Dear Mr. Gross,
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I would like to repeat that if you have an oscillation problem it is just that--a problem and in no way would that be happening in a correctly operating unit regardless of the bias setting. You most definitely have something else wrong there. Regarding the op-amp. I don't mean to offend the Linear Tech crew but you might look at the Analog Devices AD823 Dual Fet unit. For audio purposes, this is unquestionably without any shadow of a doubt, the finest opamp on the planet. Period. No you can't use it for very low noise applications where the 1028 or the 1122 would work. Other than that, nothing touches it. James Bongiorno gurriesm wrote: From: gurriesm <gurriesm@...> |
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Re: more 2600 and 2100L stuff.
gurriesm
jgross@... wrote:
From: jgross@...(First, Thanks James for the info.) I could. But since I do not have a 2600 Schematic to work from (minor issue) and the fact that it possible to put back in the correct parts, I will just hold of on that solution for the moment. I would like to use as close to the original parts in terms of performance as possible for now and I am 1/2 way there now. I went ahead and ordered a 2500 schematic from that guy who charges an arm and a leg for them. Yes I know James will free up the schematics soon, but I got to get this amp ready for use on March 5th. The only thing I have not done is set up the Bias properly on the Daughter card assembly. I do not know what the settings are to be set to and could be the source of my oscillation problem do to underbias or something to that effect. I hoping this guys copy of the service manual is complete and not just a set of schematics. Funny thing about the 2100L PreAmp, what lead me to wonder about the power supplies in the unit was the fact the according to the schematics I got, the unit runs on +18/-18. I measured +17 and -10V. Pulled zener diodes that set the base voltage and they are stamped the same part number. So I wondering if the negative supply Zener died. I did not care to figure that out and just upgraded the power supplies as stated before. So now I am using +15/-15 supplies. I can get +18/-18, but decided to back off a bit. Remember this stuff is getting old. I am in the middle of replacing all the AL caps too. The original problem claimed by the owner is that the 2100L LED's where not working right. Well the problem turned out to be one channel was dead. Typical EBAY seller miss-representation. No matter, I expect it. Further probing lead to the main amp after the volume pot seems to be intermittent. Funny thing is that since I reflowed the solder on the part, I have not gotten a failure even with cold spray. I put some hours on the PreAmp in the next few weeks to see if the problem comes back. In the mean time, If I have to replace the Op-Amps, I go with my companies LT1122 JFET op-amp. 14MHz UGBW, Typical specs are: < 0.002 THD, < 0.0002 IMD, 60V/uS slew rate, 15nV/RHz, 100dB common mode noise rejection. I beef up the bypassing right at the op-amp. I looked at the design of the main output stage and assuming the Op-Amp is bipolar, the noise at half volume is got to be pretty large since the input impedance is 220K parallel with the AC coupled impedance of the Volume pot center tap resistance to ground. Noise comes from the input bias current times the input impedance or resistance. The noise goes down when the volume is lowered to infinity simple because it effectively shorts the op-amp input to ground. The JFET type Op-Amp eliminates that problem. In fact, i just might swap the parts out anyway. Best Regards, Mark Gurries ---------------------------------------------------------- Battery Charging and Power Systems Application Engineer Linear Technology,1630 McCarthy Blvd, Milpitas, CA, 95035 WRK(408) 954-8400 x3864 Email: gurriesm@... FAX(408) 428-9413 WebSite: ---------------------------------------------------------- Work & Hobby Related Website Info: Smart Battery Charging Systems: Model Railroad Club: ---------------------------------------------------------- |
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Re: [MarantzTalk] Re:Transistors
sstinc:"First sstinc:Last"
To Neil & others,
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I would like to caution everyone concerning the Sanken output devices. I was the first person to find this company on one of my trips to Japan in the mid to late 70's. No question that they are a premier manufacturer of semiconductors in the world however, they laid the largest egg in semiconductor history when they decided to quit making metal can devices about 15 years ago. Sadly, to compound the error, their largest devices are in a short squat 2-screw package that absolutely defies trying to find an economical way to mount them. As far as the T0-3 Plastic devices mentioned THEY ARE NOT ACCEPTABLE REPLACEMENTS for the original Motorolas or Toshiba devices that were in the SAE amps. The reasons are as follows; 1. They do NOT have enough power dissipation rating. 2. They are most difinitely way too high in FT without doing a major recompensation job on the circuit. 3. Contrary to the manufacturers recommendation, the only CORRECT way to mount these plastic parts is with a "pressure bar" and NOT with a single screw. I have spent the better part of 15 years toying with these various plastic parts from almost all of the manufacturers. Trust me. I know what I'm talking about. For those of you who still insist on "hacking" your own, the only parts to use today are the newer "perforated emitter" power parts from Motorola. The numbers are MJ21193(PNP) and the MJ21194(NPN). Also, there is even a stronger set of parts, although a little softer in the SAT corner, which is the MJ21195(PNP) and MJ21196(NPN). And they are even stronger to boot. The FT is low enough so that I doubt that there will ever be any instabilities. As far as the pre-drivers (second stage), what is needed for the 2500-2600 is VERY high voltage parts and the ones I recommended previously, from Toshiba, are the only ones available in the entire world that I know of. They are 2SA1837(PNP) and 2SC4793(NPN) and both are available from Mouser. Since they are 100MHz parts, they might require some fiddling with the compensation also. I would like to state again that these things are NOT for amatuers. In order to prove everything out, you must have all of the right equipment--Period, no exception. Once again, I strongly urge anyone contemplating replacing the output devices in the higher power SAE units to NOT USE the plastic parts. You're only asking for trouble. James Bongiorno gurriesm wrote: From: gurriesm <gurriesm@...> |
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Re: [MarantzTalk] Re:Transistors
Couldn't he install small value capacitors, about .01uf
to dampen the oscillation? On Tue, 22 Feb 2000, gurriesm wrote: From: gurriesm <gurriesm@...>-=Jeff Gross=- 450 W. Byberry Rd. #T22 Philadelphia, PA 19116 (215) 464-6077 [voice] (520) 752-4371 [E-fax] |
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[MarantzTalk] Re:Transistors
gurriesm
Although these part may not be used in SAE original equipment, the
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information is usefull for the high power amplifiers such as the SAE2500, SAE2600, A1001 ect... I own a Marantz 2600 reciever which is rated at 300W/channel. I cannot say these transistors will work without any oscillation since the Ft is very high. James has already stated to watch out for the transistors with to high of a FT. Anyway, just passing on the information. By the way, I finish a complete restoration of my SAE2600 Amp. The only problem I have is the left channel with substituted second stage transistors after the Diff input. The amplifier oscillates when going into hard clipping. If I recall, they are S1376 (PNP) and S1375 (NPN) transistors. I believe these to be SAE part numbers. James, what is the nearest direct replacement you would recomend today? Anayway, while I was restoring my 2100L, I was checking out the voltage regulator stage and found one pair of complementary transitor that are the exact type that used in the 2600. I pulled them out and replaced the descrete transistor regulator cicuit with LM7815 and LM7915 Linear regulators IC instead. But I am only half way there since I need another pair to finish the Job. ---------------- Begin Forwarded Message ---------------- Date: 02/22/2000 2:54 PM Received: 02/22/2000 3:14 PM From: manta22@... Reply-To: Marantz Sig, MarantzTalk@... To: Marantz Sig, MarantzTalk@... From: manta22@... As I mentioned before, I've found some replacement power transistors for my 2325 output stage. They are made by Sanken (available through Allegro distributors in the US) and the part numbers are: 2SC3263 for the NPN and 2SA1294 for the PNP. These are complementary pairs that are made for audio power amplifiers. They are epitaxial power transistors in a plastic MT-100 (TO-3P) package and have the following characteristics: max power= 150W Vceo= 230V Ic= 15A hfe= 50 min ft= 35MHz In addition, these transistors have excellent beta linearity at high collector current and they have a good safe operating area. These are pretty high power transistors and would probably be good replacements for a Marantz 2600, 2500, 2385, or a 2325 output stage. Lower power amplifiers could use a lower power version of this series of transistors. A data sheet for the NPN & PNP can be found at : This website is miserably slow and hard to navigate, so good luck. Regards, Neil Albaugh Sr. Applications Engineer Linear Division Burr-Brown Corp. Tucson, AZ To: cc: albaugh_neil@... (bcc: Neil Albaugh/Tuc/BB1) Subject: Re: [MarantzTalk] Hello! In a message dated 2/12/00 8:34:04 PM US Mountain Standard Time,
tesla@... writes: << I need some replacement transistors, but have found little luck with some of them. The output transistors were NTE replacements, (I would like to get the original Motorola's, preferably matched), but I have had no luck finding some of the scope-circuit drivers. Thanks, Gene >> Gene; I found some replacements for the output transistors in my 2325. They actually have better characteristics than the original ones used by Marantz. They (the better ones) were not available back in the 70s. The original power transistors were in a metal TO-3 package, but the replacements are in a metal-tab plastic package. Never fear-- their leads can be bent down easily to fit the TO-3 sockets. If anyone is interested, I'll look up the part number for the new transistors. Semiconductor wafer processing is now much more repeatable now than it was 20 to 25 years ago, so matching the output transistors is less important now than it used to be. It would take a curve tracer to do the matching properly, so it's not something an average hobbyist is not going to be able to do. Anyone know of a source for scope tubes that fit a Marantz 2600? Regards, Neil Albaugh Sr. Applications Engineer Linear Division Burr-Brown Corp. Tucson, AZ ------------------------------------------------------------------------ Get what you deserve with NextCard Visa! Rates as low as 2.9% Intro or 9.9% Fixed APR, online balance transfers, Rewards Points, no hidden fees, and much more! Get NextCard today and get the credit you deserve! Apply now! Get your NextCard Visa at: ------------------------------------------------------------------------ MarantzTalk - Amps, Pre-Amps, Tuners, Receivers, and Decks; For the few who know (or want to know) what its all about!!! ----------------- End Forwarded Message ----------------- Best Regards, Mark Gurries ---------------------------------------------------------- Battery Charging and Power Systems Application Engineer Linear Technology,1630 McCarthy Blvd, Milpitas, CA, 95035 WRK(408) 954-8400 x3864 Email: gurriesm@... FAX(408) 428-9413 WebSite: ---------------------------------------------------------- Work & Hobby Related Website Info: Smart Battery Charging Systems: Model Railroad Club: ---------------------------------------------------------- |
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