Re: Polish out scratches in blue filter
I have not responded until now. I do/have used toothpaste as well to finish (not gels but regular tooth paste) with good results. However, I have now started using the headlight de-oxide products from the auto part store. I don’t have a recommended brand as I have used a couple and both worked well. ? I did however see the comment that plastic polishes don’t work on the particular blue filter mentioned. That said, I have used the de-oxide for head lights on all colors for the 7000 series ones I work on with no issues for any colors and excellent results. ? Finally as a kid my mother used a product called Glass Wax. I have been looking for some as my thoughts are it would make a great finisher/sealer. ? I suppose that is my biggest reason for finally responding. After whatever method people use to remove scratches. Are any applying a sealer of any kind and if yes what are you using? Rob
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From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Ron Simmons
Sent: Sunday, July 15, 2012 1:20 PM
To: TekScopes@...
Subject: RE: [TekScopes] Re: Polish out scratches in blue filter?
Don’t know if anyone mentioned tooth paste…..an excellent incredibly fine abrasive…takes a lot pf patience but the results are often spectacular… I use it all the time on my lightly scratched eye glasses ? -----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of KenS
Sent: Sunday, July 15, 2012 1:25 PM
To: TekScopes@...
Subject: [TekScopes] Re: Polish out scratches in blue filter ? ? Thanks to you all for your advice, both here and off-line. I'm looking into these remedies as well as fabricating a new replacement filter.
- Ken
--- In TekScopes@..., "KenS" <ken@...> wrote:
>
> Hi,
>
> I have a 2467 with some minor scratches in the blue filter. I found out the hard way with another Tek scope that you can easily make problems worse if you try to remove scratches with a plastic polish, so I am cautious. There appear no sources of NOS blue filters out there. Anybody know of any that wouldn't come up in Google? Or, a sure-fire way to polish out scratches from these blue filters?
>
> Thanks!
>
> - Ken
>
|
Re: 7B92A triggering to 1.05GHz
Hi Dennis,
My message was related to my earlier question on this forum (original post) about the reasons for and consequences of replacing the tunnel diodes in earlier 7B92A's with these hybrids. It seems I found (part of) the answer myself. I was a bit surprised to see it!
I haven't got a faster timebase but I think I have quite a good 7904+7A19 combination, since the combined -3dB bandwidth seems to be at least around 580MHz, and good flatness. I'll do more accurate testing soon with rise/fall-time measurements.
I don't know Ernest. Sounds interesting, I'll go looking for him. Delft isn't far away from where I work and live.
Raymond
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--- In TekScopes@..., "Dennis Tillman" <dennis@...> wrote:
Hi Raymond,
WOW! I will have to try that myself and try it with a 7B10 which should be
as good.
Dennis Tillman
PS: Do you know Ernest Lans in Delft? He has a big collection of Tek 7000
and a laboratory of other precision electronic instruments as well.
-----Original Message-----
From: raymonddompfrank, Sent: Sunday, July 15, 2012 1:19 PM
Tried my newly acquired SG504 (with leveling head) and saw this 7B92A
triggering happily at around 1.05 GHz on my 7904 + 7A19... Of course,
amplitude isn't shown anywhere near correctly. 7B92A is specified to trigger
"above 500MHz".
Raymond
--- In TekScopes@..., David <davidwhess@> wrote:
On Sun, 1 Jul 2012 20:59:15 -0600, David DiGiacomo
<daviddigiacomo@> wrote:
On Sun, Jul 1, 2012 at 5:29 PM, raymonddompfrank <r.domp.frank@>
wrote:
Recently, I acquired a 7B92A that in contrast with the unit that I had,
turns out to have no (discrete?) tunnel diodes in the trigger circuits but
instead, uses hybrids packaged like the ones in e.g. a 7904A's vertical amp.
I have seen references to this newer version of the 7B92A but haven't been
able to find any description of the reasons why and any possible
consequences. I would guess (and could appreciate) lower cost, higher
reliability?
I wonder whether the circuits in these hybrids still contain circuits
with tunnel diodes or do they contain more traditional circuits and if so,
are there any functional differences? i could imagine that the maximum
signal that the unit will trigger on would be lower than the tunnel
diode-equipped version.
No, there are no tunnel diodes in the late version. I thought the
trigger circuits were monolithic ICs, but maybe not.
I have found the early version to be faster, but others disagree.
I only have the later 7B92 plug-ins or I would do some tests. Both
versions include the HF Sync mode. I like them because they trigger
more cleanly than the 7B53A which is to be expected.
I thought they used monolithic ICs instead of hybrids also but that
could still be the case. Tektronix may have used that package for an
IC simply because it was the highest frequency IC package available to
them.
It is too bad there are no details on it.
------------------------------------
Yahoo! Groups Links
|
Re: 7B92A with tunnel diodes vs. version without
I just recently acquired and repaired an SG503 that was suffering from bad TI sockets. I do not have anything suitable to test triggering above its 250Mhz maximum frequency. Did your non-tunnel diode based 7B92A timebases have lower trigger sensitivity with the same setup? On Sun, 15 Jul 2012 20:19:12 -0000, "raymonddompfrank" <r.domp.frank@...> wrote: Tried my newly acquired SG504 (with leveling head) and saw this 7B92A triggering happily at around 1.05 GHz on my 7904 + 7A19... Of course, amplitude isn't shown anywhere near correctly. 7B92A is specified to trigger "above 500MHz".
Raymond
--- In TekScopes@..., David <davidwhess@...> wrote:
On Sun, 1 Jul 2012 20:59:15 -0600, David DiGiacomo
<daviddigiacomo@...> wrote:
On Sun, Jul 1, 2012 at 5:29 PM, raymonddompfrank <r.domp.frank@...> wrote:
Recently, I acquired a 7B92A that in contrast with the unit that I had, turns out to have no (discrete?) tunnel diodes in the trigger circuits but instead, uses hybrids packaged like the ones in e.g. a 7904A's vertical amp. I have seen references to this newer version of the 7B92A but haven't been able to find any description of the reasons why and any possible consequences. I would guess (and could appreciate) lower cost, higher reliability?
I wonder whether the circuits in these hybrids still contain circuits with tunnel diodes or do they contain more traditional circuits and if so, are there any functional differences? i could imagine that the maximum signal that the unit will trigger on would be lower than the tunnel diode-equipped version. No, there are no tunnel diodes in the late version. I thought the
trigger circuits were monolithic ICs, but maybe not.
I have found the early version to be faster, but others disagree. I only have the later 7B92 plug-ins or I would do some tests. Both
versions include the HF Sync mode. I like them because they trigger
more cleanly than the 7B53A which is to be expected.
I thought they used monolithic ICs instead of hybrids also but that
could still be the case. Tektronix may have used that package for an
IC simply because it was the highest frequency IC package available to
them.
It is too bad there are no details on it.
|
7B92A triggering to 1.05GHz
Hi Raymond,
WOW! I will have to try that myself and try it with a 7B10 which should be
as good.
Dennis Tillman
PS: Do you know Ernest Lans in Delft? He has a big collection of Tek 7000
and a laboratory of other precision electronic instruments as well.
toggle quoted message
Show quoted text
-----Original Message----- From: raymonddompfrank, Sent: Sunday, July 15, 2012 1:19 PM Tried my newly acquired SG504 (with leveling head) and saw this 7B92A triggering happily at around 1.05 GHz on my 7904 + 7A19... Of course, amplitude isn't shown anywhere near correctly. 7B92A is specified to trigger "above 500MHz". Raymond --- In TekScopes@..., David <davidwhess@...> wrote:
On Sun, 1 Jul 2012 20:59:15 -0600, David DiGiacomo
<daviddigiacomo@...> wrote:
On Sun, Jul 1, 2012 at 5:29 PM, raymonddompfrank <r.domp.frank@...>
wrote: Recently, I acquired a 7B92A that in contrast with the unit that I had,
turns out to have no (discrete?) tunnel diodes in the trigger circuits but instead, uses hybrids packaged like the ones in e.g. a 7904A's vertical amp. I have seen references to this newer version of the 7B92A but haven't been able to find any description of the reasons why and any possible consequences. I would guess (and could appreciate) lower cost, higher reliability? I wonder whether the circuits in these hybrids still contain circuits
with tunnel diodes or do they contain more traditional circuits and if so, are there any functional differences? i could imagine that the maximum signal that the unit will trigger on would be lower than the tunnel diode-equipped version.
No, there are no tunnel diodes in the late version. I thought the
trigger circuits were monolithic ICs, but maybe not.
I have found the early version to be faster, but others disagree.
I only have the later 7B92 plug-ins or I would do some tests. Both
versions include the HF Sync mode. I like them because they trigger
more cleanly than the 7B53A which is to be expected.
I thought they used monolithic ICs instead of hybrids also but that
could still be the case. Tektronix may have used that package for an
IC simply because it was the highest frequency IC package available to
them.
It is too bad there are no details on it.
------------------------------------ Yahoo! Groups Links
|
Re: 7B92A with tunnel diodes vs. version without
Tried my newly acquired SG504 (with leveling head) and saw this 7B92A triggering happily at around 1.05 GHz on my 7904 + 7A19... Of course, amplitude isn't shown anywhere near correctly. 7B92A is specified to trigger "above 500MHz".
Raymond
toggle quoted message
Show quoted text
--- In TekScopes@..., David <davidwhess@...> wrote:
On Sun, 1 Jul 2012 20:59:15 -0600, David DiGiacomo
<daviddigiacomo@...> wrote:
On Sun, Jul 1, 2012 at 5:29 PM, raymonddompfrank <r.domp.frank@...> wrote:
Recently, I acquired a 7B92A that in contrast with the unit that I had, turns out to have no (discrete?) tunnel diodes in the trigger circuits but instead, uses hybrids packaged like the ones in e.g. a 7904A's vertical amp. I have seen references to this newer version of the 7B92A but haven't been able to find any description of the reasons why and any possible consequences. I would guess (and could appreciate) lower cost, higher reliability?
I wonder whether the circuits in these hybrids still contain circuits with tunnel diodes or do they contain more traditional circuits and if so, are there any functional differences? i could imagine that the maximum signal that the unit will trigger on would be lower than the tunnel diode-equipped version. No, there are no tunnel diodes in the late version. I thought the
trigger circuits were monolithic ICs, but maybe not.
I have found the early version to be faster, but others disagree. I only have the later 7B92 plug-ins or I would do some tests. Both
versions include the HF Sync mode. I like them because they trigger
more cleanly than the 7B53A which is to be expected.
I thought they used monolithic ICs instead of hybrids also but that
could still be the case. Tektronix may have used that package for an
IC simply because it was the highest frequency IC package available to
them.
It is too bad there are no details on it.
|
Re: Polish out scratches in blue filter
You might want to check out the cleaning/polishing stuff used for aircraft canopies.
I have some left from my days in the airforce (it expired, so it was canned, works just fine still :-)
Given the price of an aircraft canopy and the need to keep them pristine I'd say this stuff should work for the Tek screen too.
Wilko
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--- In TekScopes@..., "Ron Simmons" <rjsimmons@...> wrote:
Don't know if anyone mentioned tooth paste...an excellent incredibly fine
abrasive.takes a lot pf patience but the results are often spectacular. I
use it all the time on my lightly scratched eye glasses
-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf
Of KenS
Sent: Sunday, July 15, 2012 1:25 PM
To: TekScopes@...
Subject: [TekScopes] Re: Polish out scratches in blue filter
Thanks to you all for your advice, both here and off-line. I'm looking into
these remedies as well as fabricating a new replacement filter.
- Ken
--- In TekScopes@... <mailto:TekScopes%40yahoogroups.com> ,
"KenS" <ken@> wrote:
Hi,
I have a 2467 with some minor scratches in the blue filter. I found out
the hard way with another Tek scope that you can easily make problems worse
if you try to remove scratches with a plastic polish, so I am cautious.
There appear no sources of NOS blue filters out there. Anybody know of any
that wouldn't come up in Google? Or, a sure-fire way to polish out scratches
from these blue filters?
Thanks!
- Ken
|
Re: Polish out scratches in blue filter
If you can't get the scratches out, you may be able to find some blue transparency film at Staples. This is the stuff you would use with an overhead projector.
It should stick to the CRT face just with static electricity.
HankC, Boston
|
Re: Help with R7903 needed, some success...
Hi Keith,
Time to update the title of this thread? Nice success, but how do "you" manage to have a 'scope with so many problems! :=)
Wavy readout is common. How pronounced depends on sweep frequency. You can minimize this (see cal proc somewhere) but don't expect miracles of that.
Readout centering can be adjusted also.
Your readout misses the decimal scaling, Time Slot TS-1. The -15V time slot pulse TS-1 should appear at interface contacts B33 of all bays, but the fault could be in a logic circuit further on. It's a good idea to read the readout theory first!
Albert
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Good News! We now have a working CRT and R7903!
The Short story: After replacing one resistor the screen came alive. After some adjustments there are two items remaining with this project that I need help with:
1. The readouts only gives one numeral. For instance, .5uS, 5uS, and 50uS all display as 5uS. Similarly, .5V, 5mV, and 50mV all say 5mV. Same for all settings, and regardless which plugins I use. The 10X multiplier makes no difference in the Readout display, though it does make it a little "wavy", like a slight vibration. Also, the Readouts are positioned a little low on the screen, so that the lower ones are half-obscured off the bottom of CRT frame.
----
Your thoughts on how to approach the Readout problem?
Thanks,
Keith Ostertag
|
Re: Help with R7903 needed, some success...
Wow. Good deal. I suspect I learned as much from you fixing your oscilloscope as you did or at least enough to continue work on my functioning 7834. On Sun, 15 Jul 2012 16:57:31 -0000, "keithostertag" <keitho@...> wrote: Good News! We now have a working CRT and R7903!
The Short story: After replacing one resistor the screen came alive. After some adjustments there are two items remaining with this project that I need help with:
1. The readouts only gives one numeral. For instance, .5uS, 5uS, and 50uS all display as 5uS. Similarly, .5V, 5mV, and 50mV all say 5mV. Same for all settings, and regardless which plugins I use. The 10X multiplier makes no difference in the Readout display, though it does make it a little "wavy", like a slight vibration. Also, the Readouts are positioned a little low on the screen, so that the lower ones are half-obscured off the bottom of CRT frame. This should be relatively straightforward. 2.) I'm going to need a source for some of the push-button switches on the front panel.
The longer story (for those interested):
I was following Albert's suggestion to check the continuity around P1675 when I found pin 3 to TP1883 measured around 5Meg ohms. When I went to touch one side of R1880 in order to lift it, it literally fell apart into two clean pieces. No burn or stress marks of any kind- and nothing else on that board was found bad.
After replacing R1880 the CRT came right up, and I went through both the PS cal as well as the z-axis cal. The are a few sections of the z-axis cal that I can't do (I guess) since I don't have a marker generator. (?)
I want to say that after all these weeks of working on this project I was immensely happy and relieved to see that first trace appear! My guess is that this R7903 had been sitting unused (due to its broken condition) for many years before it got to me. Many caps needed to be replaced on several boards, mostly the PS. Of course I would not have been able to do this without your help and instruction, and I am grateful for your patience and perseverance. Really a good example of group effort! Something similar may have happened to my 7854. The vertical gain in the CRT amplifier was screwed up and as it got worse, the readout was adjusted to compensate without fixing the actual problem. When that was no longer possible, I suspect it sat in storage for lack of will, ability, or funds to repair. I know even _less_ about logic circuits than I do analog circuits, so fixing this Readout problem will be very interesting. I am reading the manual...
Your thoughts on how to approach the Readout problem? I would start by looking for a missing time slot pulse while paying particular attention to slot 1. Does the readout show the inverted and uncalibrated functions correctly?
|
Hi This is my first post.
I wish to thank every members for sharing their experiences.
Recently i bought a very nice 321A , evolution of 321, the first battery operated Tek scope.
Mister June 1971 on the TeK calendar:
Very nice little scope with it's leather case, paper doc, one X100 probe.
BUT …. no sweep exactly as described in these 2 posts:
Q135 and Q145 locked good testing them with ohmmeter, and …. a curve tracer after snipped'em out.
In spite of that, i replaced both of them with 2N2369,and the scope came back to live
Without the last post of Julian i'm not sure i would have replaced them so quickly
BR
Pierre
|
Re: Polish out scratches in blue filter
Don’t know if anyone mentioned tooth
paste…..an excellent incredibly fine abrasive…takes a lot pf
patience but the results are often spectacular… I use it all the time on
my lightly scratched eye glasses
?
toggle quoted message
Show quoted text
-----Original Message-----
From: TekScopes@...
[mailto:TekScopes@...] On Behalf
Of KenS
Sent: Sunday, July 15, 2012 1:25
PM
To: TekScopes@...
Subject: [TekScopes] Re: Polish
out scratches in blue filter
?
?
Thanks to you all for
your advice, both here and off-line. I'm looking into these remedies as well as
fabricating a new replacement filter.
- Ken
--- In TekScopes@...,
"KenS" wrote:
>
> Hi,
>
> I have a 2467 with some minor scratches in the blue filter. I found out
the hard way with another Tek scope that you can easily make problems worse if
you try to remove scratches with a plastic polish, so I am cautious. There
appear no sources of NOS blue filters out there. Anybody know of any that
wouldn't come up in Google? Or, a sure-fire way to polish out scratches from
these blue filters?
>
> Thanks!
>
> - Ken
>
|
Re: Polish out scratches in blue filter
Thanks to you all for your advice, both here and off-line. I'm looking into these remedies as well as fabricating a new replacement filter.
- Ken
toggle quoted message
Show quoted text
--- In TekScopes@..., "KenS" <ken@...> wrote:
Hi,
I have a 2467 with some minor scratches in the blue filter. I found out the hard way with another Tek scope that you can easily make problems worse if you try to remove scratches with a plastic polish, so I am cautious. There appear no sources of NOS blue filters out there. Anybody know of any that wouldn't come up in Google? Or, a sure-fire way to polish out scratches from these blue filters?
Thanks!
- Ken
|
Re: Help with R7903 needed, some success...
Are you sure you don't have a lose or mis-plugged cable or connector? After
all that you have been through, that would be the first thing to check.
?
Good job though. Grats!
?
Tom
?
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----- Original Message -----
Sent: Sunday, July 15, 2012 12:57
PM
Subject: [TekScopes] Re: Help with R7903
needed, some success...
?The longer story (for those
interested):
II know even _less_ about logic circuits than I do analog
circuits, so fixing this Readout problem will be very interesting. I am
reading the manual...
Your thoughts on how to approach the Readout
problem?
?
|
I have no affiliation with the seller.
-Kurt
|
Re: Help with R7903 needed, some success...
Good News! We now have a working CRT and R7903!
The Short story: After replacing one resistor the screen came alive. After some adjustments there are two items remaining with this project that I need help with:
1. The readouts only gives one numeral. For instance, .5uS, 5uS, and 50uS all display as 5uS. Similarly, .5V, 5mV, and 50mV all say 5mV. Same for all settings, and regardless which plugins I use. The 10X multiplier makes no difference in the Readout display, though it does make it a little "wavy", like a slight vibration. Also, the Readouts are positioned a little low on the screen, so that the lower ones are half-obscured off the bottom of CRT frame.
2.) I'm going to need a source for some of the push-button switches on the front panel.
The longer story (for those interested):
I was following Albert's suggestion to check the continuity around P1675 when I found pin 3 to TP1883 measured around 5Meg ohms. When I went to touch one side of R1880 in order to lift it, it literally fell apart into two clean pieces. No burn or stress marks of any kind- and nothing else on that board was found bad.
After replacing R1880 the CRT came right up, and I went through both the PS cal as well as the z-axis cal. The are a few sections of the z-axis cal that I can't do (I guess) since I don't have a marker generator. (?)
I want to say that after all these weeks of working on this project I was immensely happy and relieved to see that first trace appear! My guess is that this R7903 had been sitting unused (due to its broken condition) for many years before it got to me. Many caps needed to be replaced on several boards, mostly the PS. Of course I would not have been able to do this without your help and instruction, and I am grateful for your patience and perseverance. Really a good example of group effort!
I know even _less_ about logic circuits than I do analog circuits, so fixing this Readout problem will be very interesting. I am reading the manual...
Your thoughts on how to approach the Readout problem?
Thanks,
Keith Ostertag
|
Re: Restoring 9A1 plugins: need a foto
hello Albert, this both resistors are 1,5k so it may be still the same then in the 3A1.
I will test what it will do when the washing is finished (a lot of work, the old Tek is extremly dirty..)
greetings Martin
To: TekScopes@yahoogroupcom From: aodiversen@... Date: Sun, 15 Jul 2012 11:26:51 +0000 Subject: [TekScopes] Re: Restoring 9A1 plugins: need a foto
?
(continued, last time I hope, grrr...)
I found the 9A1 now in Stan's book and in the 1964 catalog. Being designed for the 506, the plugin has BW 23 MHz (as opposed to 10 MHz for 3A1). Hence those resistors might have a different value in the 9A1.
Albert
> (continued)
> Not 3A6 but 3A1. You probably have a 3A1 yourself. The internals (left picture) are exactly those of a 3A1. Obviously the big flat 1.5k resistors (310-596) have been replaced.
> Albert
>
>
> > Hi Martin,
> >
> > What a strange type designation, does this plugin have a dedicated purpose?
> > The front looks identical to that of a 3A6. The schematics of the 3A6 might help?
> >
> > Albert
> >
> > > hello friends,
> > > I am restoring a 561A with, a 9A1 plugin.In this 9A1, I am not sure if that is original, so I need please a picture made from another 9A1,upside, back, where is the deflection tubes E55L, there are some power resistors mounted.
> > > I want to see them on a picture, and please how many ohms they have, I have no application of this 9A1
> > > greetings from germanyMartin
> > > - picture: my 9A1 -
> > >
> >
>
|
Step #1: get the manual downloaded from the BAMA mirror site and check the power supplies.
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--- In TekScopes@..., "raabiz" <raabiz@...> wrote:
Hi
I got this scope used and when i started it i couldnt get a trace, after some fiddling i discovered that the trace was as wide as the screen.
There is some reaction from the controls and i can move the light on and off screen.
I repair and build tube amps so i have some basic electronic skill.
Anyone had this problem or similar please help.
Thanks in advance/Roger
|
Re: A nearly working 7B80 (S/N B058022)
Hi John,
It seems that you mixed up two ICs. At my B058082 PCB, U722 is a round case CA3130, while U842 is a DIL labeled 0067-02 (741 in another unit). Both are correctly marked at the PCB and both are correctly shown in the PCB layout pictures and in the parts list.
Albert
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Put in an offer and got a good looking 7B80 TB from ePay. Seller said untested. Unusually for me it seemed to work fine too, but when doing a CAL check found sweep slightly out and front panel "Sweep Cal" having no effect. Downloaded manual (070-1959-00) shows a 741 op-amp buffering the sweep cal pot input to the time base with a variety of catching diodes and resistors twixt this control and pin 3 of the op amp.
But the op amp number on schematic is U722 while the IC marked on the board drawing is U842 and referencing the parts list shows no mention of a S/N affected U number for this one. U416 (the buffer for HOR Shift) is correct both on Schematic and board drawing so it seems that the U842 reference should read U722.
Tne fault found: FP SWEEP CAL pot had correct voltages in and out (+50v in and varying dc out) but no changes in voltage at pin 3 of (U722)
10mS and 10uS timing cal pots were affecting timing as they should, so checked CR117,116 and resistors R717,R716, cap C712 all OK .
Of course, the very last res checked R706 357K was found open, so Murphy's still not evicted from the place.
Found a 357k from my 360k 1% MF stock and replaced. Now all is fine.
Hope this may be of use to others, at some time.
John Byers
|
Re: Restoring 9A1 plugins: need a foto
(continued, last time I hope, grrr...)
I found the 9A1 now in Stan's book and in the 1964 catalog. Being designed for the 506, the plugin has BW 23 MHz (as opposed to 10 MHz for 3A1). Hence those resistors might have a different value in the 9A1.
Albert
toggle quoted message
Show quoted text
(continued)
Not 3A6 but 3A1. You probably have a 3A1 yourself. The internals (left picture) are exactly those of a 3A1. Obviously the big flat 1.5k resistors (310-596) have been replaced.
Albert
Hi Martin,
What a strange type designation, does this plugin have a dedicated purpose?
The front looks identical to that of a 3A6. The schematics of the 3A6 might help?
Albert
hello friends,
I am restoring a 561A with, a 9A1 plugin.In this 9A1, I am not sure if that is original, so I need please a picture made from another 9A1,upside, back, where is the deflection tubes E55L, there are some power resistors mounted.
I want to see them on a picture, and please how many ohms they have, I have no application of this 9A1
greetings from germanyMartin
- picture: my 9A1 -
|
Re: Restoring 9A1 plugins: need a foto
(continued)
Not 3A6 but 3A1. You probably have a 3A1 yourself. The internals (left picture) are exactly those of a 3A1. Obviously the big flat 1.5k resistors (310-596) have been replaced.
Albert
toggle quoted message
Show quoted text
Hi Martin,
What a strange type designation, does this plugin have a dedicated purpose?
The front looks identical to that of a 3A6. The schematics of the 3A6 might help?
Albert
hello friends,
I am restoring a 561A with, a 9A1 plugin.In this 9A1, I am not sure if that is original, so I need please a picture made from another 9A1,upside, back, where is the deflection tubes E55L, there are some power resistors mounted.
I want to see them on a picture, and please how many ohms they have, I have no application of this 9A1
greetings from germanyMartin
- picture: my 9A1 -
|
David Hess
mescalero