I'm hoping someone with access to a TR-7 schematic can answer this question.? In the service manual for the R-7 receiver, it says, with respect?to the PTO buffer board, "When +10V (RCT) is applied to module pin 22, CR301 turns on through an identical diode
and load resistor?located in the TR7, thus coupling the R7 PTO to the TR7 synthesizer."
Can someone please let me know the size of that load resistor in the TR7?
Thanks in advance.
Art Delibert, KB3FJO
|
Decided to do something constructive today, so I replaced the vernier
drive on my L-4B.? The original vernier has very little resistance when
I turn it.? Here's some before and after pics.? The ever so slightly
longer, maybe 1/2" or so leads on the neon lamps I replaced were long
enough I could rotate the front panel out of the way.? I may disassemble
the original vernier and look at repairing it.? Pretty much a beginner
when it comes to machinist work, but I do have a mini lathe.? Upgrading
it to a 16" bed is another on the round to it projects list.? Thanks
again for all the comments on the vernier drive.
73
Stan
KM4HQE
|
I wouldn¡¯t use Vaseline even on the window-slide ¡°button¡± on the earlier Twins. Good old GP grease still works absolutely fine and should last for over 25 years in a normal environment.?
Synthetics are an improvement from the standpoint of transferrance from the pinion to the nylon gear ¡ª provided the grease won¡¯t damage nylon.?
I would not use white lithium automotive ¡°door grease¡±, as it dries out fairly quickly.?
If you want to remove transferred grease from the nylon gear, use mineral spirits, then wipe With IPA to remove the spirits. This will remove much, but not all, of the grease. The only way to get it all is to remove the PTO and disassemble it. Then, you can use a toothbrush with the mineral spirits to get the grease out of the teeth. You¡¯ll want to do this with the frequency disc removed.?
I uploaded a procedure some time ago for rehabbing an early 4 Line PTO.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Jan 28, 2024 at 09:33, Jim VE7RF < jim.thom@...> wrote: Per W8JI, Vaseline liquifies at just 100 Deg F...and makes for excellent fire starter.?
?
Paul's method of synthetic grease? is top notch.? It will LAST.?
|
Re: RV-4 and TR-4 Signal Issue
Hey Steve,
Thanks for the info. I do have a spare TR-4 that I can try. It needs a tiny bit of work and it¡¯ll be ok to do some testing on. ?
It¡¯s a new problem for sure. When I first got the set, the dial tracking and the gears on the RV-4 were way off, so once that was all lined back up and put in to place the thing worked like it should. Hasn¡¯t been tinkered with much and neither has the TR-4. ?
I will try to look at it today and see what I can isolate. Thanks again!
Cody N4AAT
|
Per W8JI, Vaseline liquifies at just 100 Deg F...and makes for excellent fire starter.?
?
Paul's method of synthetic grease? is top notch.? It will LAST.?
|
Re: RV-4 and TR-4 Signal Issue
Cody, if you have a second TR-4 or VFO, try swapping around. I suspect that you don¡¯t but if you can borrow one, that can help you isolate the problem.?
It is possible that the switch in the RV-4 is dirty enough to conduct but that¡¯s a real stretch, I think. Look for signs in the rig and the VFO of others doing rework or broken wires around the switch in the VFO and around the connector in the bottom of the TR-4.?
73,
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sun, Jan 28, 2024 at 00:42, Randy N4ATT via groups.io < N4AAT@...> wrote: I should clarify. When transmitting and the RV-4 is off, the signal is sent on either the TR-4 frequency or the RV-4 frequency. ?I discovered this when calling CQ on CW and checking out the RBN one night. ?
Has anyone else had a problem like this?
Thanks
Cody N4AAT
|
I think the shaft is hardened steel so not sure how long a brass or bronze one would last. It is a 1/4¡± Shaft in the Drakes.?
Steve Wedge, W1ES/4
Time flies like an arrow. Fruit flies like a banana.
On Sat, Jan 27, 2024 at 22:57, Gary Follett < xntrick1948@...> wrote: I think that shaft is 1/8 inch diameter brass rod. in Ten Tec PTO¡¯s. I have made a few of them from brass and they worked well. I use an old Myford wood lathe, which works well with brass and Aluminum, to make these.
This part is so simple, with only one important machined surface, the bearing trench), you could clamp your hand drill into a vise, chuck up a piece of that 1/8 inch brass and make a proper bearing groove, using a hand held small rat tail file, power file the groove. Then you cut both ends to proper length with a hack saw. If you want to pretty up the ends (not required) you can put the piece back into the drill and power file with a mill file on both ends.
Gary
W0DVN On Jan 27, 2024, at 6:29?PM, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
And, as importantly, whether or not the shaft is worn down from many years of use. ?There is a "trick" on Ron's website that uses a relocation of the central shaft to get the ball bearings off of the worn spot. ?It involves getting some spacing material inside the coupler to force the shaft to ride in a new location.Alternately, one could re-create a shaft, with the appropriate machine tools and hardening procedures...Steve Wedge, W1ES/4Time flies like an arrow.? Fruit flies like a banana.Sent with Proton Mail secure email.On Saturday, January 27th, 2024 at 3:56 PM, wb6ogd <garywinblad@...> wrote:Michael,
Vasoline works for me.
So does light oil (sewing machine type oil).
What is critical is the "squeeze" of the tabs around the edge.
73,
Gary
WB6OGD
On 01/27/2024 11:20 AM PST Michael.2E0IHW via groups.io blumu@... wrote:
How does Vaseline perform? (Maybe only known in the UK.)
My R4-B is ok at present, but...
Michael 2E0IHW
On 27/01/2024 15:17, Paul Christensen wrote:
We all have our opinions but consider using only newer synthetic
grease. For mechanical PTO and VFO rebuilds, I¡¯m using Mobile1 and
Valvoline SynPower brands. Petroleum axle and lithium-based grease has
a short lubrication lifetime.
Likewise, I strongly suggest staying away from pure silicone and
Teflon-based grease like TriFlow. I nearly ruined a Drake 1A VFO
gearbox after a rebuild with TriFlow. Teflon and silicone lose its
ability to lubricate in conditions of angular pressure. After spending
a day removing the TriFlow grease, the assembly was re-packed with
Mobile1 (Red) synthetic grease and the assembly moves as smoothly today
as it did after the rebuild ten years ago.
Paul, W9AC
|
Re: TR-7 BFO 8050 Khz (8.050 Mhz) Xtal Needed
Sorry all,
?
Early in the morning for me and I missed the FREQUENCY in the header!
?
73, Clint, VE3CMQ
?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]>
On Behalf Of Clint VE3CMQ via groups.io
Sent: Sunday, 28 January 2024 06:23
To: [email protected]
Subject: Re: [DRAKE-RADIO] TR-7 BFO 8050 Khz (8.050 Mhz) Xtal Needed
?
What frequency do you need?
?
Clint, ve3cmq
?
|
Re: TR-7 BFO 8050 Khz (8.050 Mhz) Xtal Needed
What frequency do you need?
?
Clint, ve3cmq
?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]>
On Behalf Of Dave W1VSX via groups.io
Sent: Saturday, 27 January 2024 15:51
To: [email protected]
Subject: [DRAKE-RADIO] TR-7 BFO 8050 Khz (8.050 Mhz) Xtal Needed
?
I have a TR-7 with a dodgy BFO Xtal on the PBT/REF board does anyone have a spare Xtal, or in the alternative a spare PBT/REF board, they are willing to sell?
Oh, and sorry if I screwed this up, it is my first Drake post? - if I did something wrong, corrective suggestions are welcome - if you want to yell at me, I already have my XYL doing a great job with that.
Thank you.
73
--dave
W1VSX
|
Re: TR-7 BFO 8050 Khz (8.050 Mhz) Xtal Needed
Please define "dodgy". What exactly is it doing? Have you ruled out other components, soldering, tin whiskers, etc. ? You can often find the boards on eBay but not cheap. Better to repair if you can. 73 -Jim NU0C On Sat, 27 Jan 2024 13:51:08 -0800 "Dave W1VSX via groups.io" <davetumey@...> wrote: I have a TR-7 with a dodgy BFO Xtal on the PBT/REF board does anyone have a spare Xtal, or in the alternative a spare PBT/REF board, they are willing to sell?
Oh, and sorry if I screwed this up, it is my first Drake post? - if I did something wrong, corrective suggestions are welcome - if you want to yell at me, I already have my XYL doing a great job with that.
Thank you.
73
--dave
W1VSX
|
Re: RV-4 and TR-4 Signal Issue
I should clarify. When transmitting and the RV-4 is off, the signal is sent on either the TR-4 frequency or the RV-4 frequency. ?I discovered this when calling CQ on CW and checking out the RBN one night. ?
Has anyone else had a problem like this?
Thanks
Cody N4AAT
|
Re: TR-7 BFO 8050 Khz (8.050 Mhz) Xtal Needed
My bad, you did say it was on the PBT/Ref board. I do not have one of these unless I decide to part out my R7.
Gary
toggle quoted message
Show quoted text
On Jan 27, 2024, at 10:00?PM, Gary Follett <xntrick1948@...> wrote:
What board holds that crystal - I don¡¯t recall. I have some spare TR7 boards and may have the crystal.
Gary
W0DVN On Jan 27, 2024, at 3:51?PM, Dave W1VSX via groups.io <davetumey@...> wrote:
I have a TR-7 with a dodgy BFO Xtal on the PBT/REF board does anyone have a spare Xtal, or in the alternative a spare PBT/REF board, they are willing to sell?
Oh, and sorry if I screwed this up, it is my first Drake post? - if I did something wrong, corrective suggestions are welcome - if you want to yell at me, I already have my XYL doing a great job with that.
Thank you.
73
--dave
W1VSX
|
Re: TR-7 BFO 8050 Khz (8.050 Mhz) Xtal Needed
What board holds that crystal - I don¡¯t recall. I have some spare TR7 boards and may have the crystal.
Gary
toggle quoted message
Show quoted text
On Jan 27, 2024, at 3:51?PM, Dave W1VSX via groups.io <davetumey@...> wrote:
I have a TR-7 with a dodgy BFO Xtal on the PBT/REF board does anyone have a spare Xtal, or in the alternative a spare PBT/REF board, they are willing to sell?
Oh, and sorry if I screwed this up, it is my first Drake post? - if I did something wrong, corrective suggestions are welcome - if you want to yell at me, I already have my XYL doing a great job with that.
Thank you.
73
--dave
W1VSX
|
I think that shaft is 1/8 inch diameter brass rod. in Ten Tec PTO¡¯s. I have made a few of them from brass and they worked well. I use an old Myford wood lathe, which works well with brass and Aluminum, to make these.
This part is so simple, with only one important machined surface, the bearing trench), you could clamp your hand drill into a vise, chuck up a piece of that 1/8 inch brass and make a proper bearing groove, using a hand held small rat tail file, power file the groove. Then you cut both ends to proper length with a hack saw. If you want to pretty up the ends (not required) you can put the piece back into the drill and power file with a mill file on both ends.
Gary
toggle quoted message
Show quoted text
On Jan 27, 2024, at 6:29?PM, Steve Wedge, W1ES/4 via groups.io <w1es@...> wrote:
And, as importantly, whether or not the shaft is worn down from many years of use. ?There is a "trick" on Ron's website that uses a relocation of the central shaft to get the ball bearings off of the worn spot. ?It involves getting some spacing material inside the coupler to force the shaft to ride in a new location.Alternately, one could re-create a shaft, with the appropriate machine tools and hardening procedures...Steve Wedge, W1ES/4Time flies like an arrow.? Fruit flies like a banana.Sent with Proton Mail secure email.On Saturday, January 27th, 2024 at 3:56 PM, wb6ogd <garywinblad@...> wrote:Michael,
Vasoline works for me.
So does light oil (sewing machine type oil).
What is critical is the "squeeze" of the tabs around the edge.
73,
Gary
WB6OGD
On 01/27/2024 11:20 AM PST Michael.2E0IHW via groups.io blumu@... wrote:
How does Vaseline perform? (Maybe only known in the UK.)
My R4-B is ok at present, but...
Michael 2E0IHW
On 27/01/2024 15:17, Paul Christensen wrote:
We all have our opinions but consider using only newer synthetic
grease. For mechanical PTO and VFO rebuilds, I¡¯m using Mobile1 and
Valvoline SynPower brands. Petroleum axle and lithium-based grease has
a short lubrication lifetime.
Likewise, I strongly suggest staying away from pure silicone and
Teflon-based grease like TriFlow. I nearly ruined a Drake 1A VFO
gearbox after a rebuild with TriFlow. Teflon and silicone lose its
ability to lubricate in conditions of angular pressure. After spending
a day removing the TriFlow grease, the assembly was re-packed with
Mobile1 (Red) synthetic grease and the assembly moves as smoothly today
as it did after the rebuild ten years ago.
Paul, W9AC
|
What a great resource for Drake lovers!! I¡¯m overwhelmed by the response. I¡¯m away from the receiver until mid next week but as soon as I get back to it and determine what frequency Drake uses for the bands I¡¯m interested in, I¡¯ll PM all that responded.
This little receiver seems to work really well even without the noise blanker which is apparently rare. My receiver is fairly clean and works well on all the frequencies it has crystals. I may be pulling some of the crystals I don¡¯t have plans to use to make room for others. If I do, I¡¯ll post those for others that may be interested.
Thanks,
Tom N5AMA
|
And, as importantly, whether or not the shaft is worn down from many years of use. There is a "trick" on Ron's website that uses a relocation of the central shaft to get the ball bearings off of the worn spot. It involves getting some spacing material inside the coupler to force the shaft to ride in a new location.
Alternately, one could re-create a shaft, with the appropriate machine tools and hardening procedures...
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with Proton Mail secure email.
toggle quoted message
Show quoted text
On Saturday, January 27th, 2024 at 3:56 PM, wb6ogd <garywinblad@...> wrote: Michael,
Vasoline works for me.
So does light oil (sewing machine type oil).
What is critical is the "squeeze" of the tabs around the edge.
73,
Gary
WB6OGD
On 01/27/2024 11:20 AM PST Michael.2E0IHW via groups.io blumu@... wrote:
How does Vaseline perform? (Maybe only known in the UK.)
My R4-B is ok at present, but...
Michael 2E0IHW
On 27/01/2024 15:17, Paul Christensen wrote:
We all have our opinions but consider using only newer synthetic
grease. For mechanical PTO and VFO rebuilds, I¡¯m using Mobile1 and
Valvoline SynPower brands. Petroleum axle and lithium-based grease has
a short lubrication lifetime.
Likewise, I strongly suggest staying away from pure silicone and
Teflon-based grease like TriFlow. I nearly ruined a Drake 1A VFO
gearbox after a rebuild with TriFlow. Teflon and silicone lose its
ability to lubricate in conditions of angular pressure. After spending
a day removing the TriFlow grease, the assembly was re-packed with
Mobile1 (Red) synthetic grease and the assembly moves as smoothly today
as it did after the rebuild ten years ago.
Paul, W9AC
|
Re: OT: Searching for the Name/Author of an Old Beginning Electronics Book
I have a few methods for finding such things:
1) Ebay obviously, but check the box "completed auctions" on the left-hand side.? That way you will see older auctions as well.? There is also a check box for "worldwide".? You can also visit foreign Ebay sites, such as ebay.com.au (australia), ebay.com.it, ebay.com.de ....etc? Foreign ebay items will not appear on the US site unless they ship to the US.
2) Do a google search such as beginning electronics book images.? Or maybe throw in the word vintage also.? There will be pages and pages of images.? Sometimes you will see an image of the item you are looking for.? And hopefully you can see the author.? This has also worked for me when I was looking for schematics.
3) Different search engines give different results.? Try duckduckgo, yahoo, bing, hotbot, etc.
|
Re: [TenTec] Replacement of 580 Delta PTO lubricant
I used that to re-lube my Argonaut 509 and to lube the bandswitch on my SB-200 as the amp following my 32S-1. Absolutely smooth on all.
toggle quoted message
Show quoted text
On Jan 27, 2024, at 4:43?PM, Jim Shorney <jimNU0C@...> wrote:
?
I dunno, the TriFlow that I use is a bicycle bearing grease.
The R390 guys like Phil Woods bicycle grease. I have a tube of that as well.
73
-Jim
NU0C
On Sat, 27 Jan 2024 15:45:01 -0600
"Gary Follett" <xntrick1948@...> wrote:
I am fortunate to have an ultrasonic cleaner so, once I remove a PTO from a radio, I can sonicate it to get the old grease out and then flow a lubricant in. I might not chose Tri Flow as it is pretty low in viscosity and not intended for durable use applications but I¡¯ll see what I learn next time I need to do one of these.
This would also work well with Collins PTO¡¯s.
|
Aside from all that it has a relatively low melting point. 73 -Jim NU0C On Sat, 27 Jan 2024 15:46:46 -0600 "Gary Follett" <xntrick1948@...> wrote: This is why I never use Vaseline as a lubricant for anything but living things:
Conents: Water (aqua), Glycerin, Stearic Acid, Isopropyl Palmitate, Glycol Stearate, Peg-100 Stearate, Mineral Oil, Dimethicone, Petrolatum, Glyceryl Stearate, Phenoxyethanol, Cetyl Alcohol, Methylparaben, Acrylates/c10-30 Alkyl Acrylate Crosspolymer, Triethanolamine, Propylparaben, Disodium EDTA, Stearamide Amp, Cedrol, Dihydroxypropyltrimonium Chloride and Hydroxyethyl Urea.
Gary
W0DVN
On Jan 27, 2024, at 2:56?PM, wb6ogd <garywinblad@...> wrote:
Michael,
Vasoline works for me.
So does light oil (sewing machine type oil).
What is critical is the "squeeze" of the tabs around the edge.
73,
Gary
WB6OGD
On 01/27/2024 11:20 AM PST Michael.2E0IHW via groups.io <blumu@...> wrote:
How does Vaseline perform? (Maybe only known in the UK.)
My R4-B is ok at present, but...
Michael 2E0IHW
On 27/01/2024 15:17, Paul Christensen wrote:
We all have our opinions but consider using only newer synthetic
grease. For mechanical PTO and VFO rebuilds, I¡¯m using Mobile1 and
Valvoline SynPower brands. Petroleum axle and lithium-based grease has
a short lubrication lifetime.
Likewise, I strongly suggest staying away from pure silicone and
Teflon-based grease like TriFlow. I nearly ruined a Drake 1A VFO
gearbox after a rebuild with TriFlow. Teflon and silicone lose its
ability to lubricate in conditions of angular pressure. After spending
a day removing the TriFlow grease, the assembly was re-packed with
Mobile1 (Red) synthetic grease and the assembly moves as smoothly today
as it did after the rebuild ten years ago.
Paul, W9AC
-- 73 -Jim NU0C
|
Re: [TenTec] Replacement of 580 Delta PTO lubricant
I dunno, the TriFlow that I use is a bicycle bearing grease. The R390 guys like Phil Woods bicycle grease. I have a tube of that as well. 73 -Jim NU0C On Sat, 27 Jan 2024 15:45:01 -0600 "Gary Follett" <xntrick1948@...> wrote: I am fortunate to have an ultrasonic cleaner so, once I remove a PTO from a radio, I can sonicate it to get the old grease out and then flow a lubricant in. I might not chose Tri Flow as it is pretty low in viscosity and not intended for durable use applications but I¡¯ll see what I learn next time I need to do one of these.
This would also work well with Collins PTO¡¯s.
|
Jim Shorney