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Post subject: Re: Multi- cap cans
Posted: Sun Jan 05, 2014 11:08 am
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Aspiring Musician
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Appears to actually be a 20/20/20uFd.

ImageImage
[URL=http://s1351.photobucket.com/user/vinyl9/media/photo34_zpsc0a8fb6c.jpg.html]Image

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Post subject: Re: Multi- cap cans
Posted: Sun Jan 05, 2014 11:10 am
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Post subject: Re: Multi- cap cans
Posted: Sun Jan 05, 2014 11:17 am
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Retroverbial wrote:
Yipe, somebody stole that little guy's knobs!

Arjay


Plus the speaker, upper back panel and second speaker jack.

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Post subject: Re: Multi- cap cans
Posted: Sun Jan 05, 2014 11:20 am
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Vinyl,

FWIW...those are Russian made 6V6GT's. Despite the Made in GT BRITAIN stamps. Prolly, mil spec 6N6C. Russian output tubes usually have a saucer-shape getter cup, that are often pointed down. Placed just above the border of the glass and base.

The 20/20/20 at 450 VDC cap are often used in these transition Princetons. Regardless of what the schemo says. The 30/30/30 at 525 VDC CE can will work fine. It has same dimensions as your Astron can. The extra capacitance is ok with a healthy 5Y3GT. I would personally choose the 525VDC can over the 475VDC can when possible. Better stability under heat over time.

Keep those great Astron & Blue MOLDED coupling caps (unless leaking DC). Replace the bypass & bias supply 'lytics. As well as the main filter can. Check the bias, afterwards. May need to sub in various resistors into the bias suplly to get into proper range.

Good luck! It's a great little amp. :D :D :D


http://diy-tubes.com/image/cache/data/t ... 00x500.jpg

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Post subject: Re: Multi- cap cans
Posted: Sun Jan 05, 2014 11:27 am
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vinyl wrote:
Retroverbial wrote:
Yipe, somebody stole that little guy's knobs!

Arjay


Plus the speaker, upper back panel and second speaker jack.


PM sent.

Arjay

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Post subject: Re: Multi- cap cans
Posted: Sun Jan 05, 2014 1:34 pm
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Aspiring Musician
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BMW2002Ti wrote:
Vinyl,

FWIW...those are Russian made 6V6GT's. Despite the Made in GT BRITAIN stamps. Prolly, mil spec 6N6C. Russian output tubes usually have a saucer-shape getter cup, that are often pointed down. Placed just above the border of the glass and base.

The 20/20/20 at 450 VDC cap are often used in these transition Princetons. Regardless of what the schemo says. The 30/30/30 at 525 VDC CE can will work fine. It has same dimensions as your Astron can. The extra capacitance is ok with a healthy 5Y3GT. I would personally choose the 525VDC can over the 475VDC can when possible. Better stability under heat over time.

Keep those great Astron & Blue MOLDED coupling caps (unless leaking DC). Replace the bypass & bias supply 'lytics. As well as the main filter can. Check the bias, afterwards. May need to sub in various resistors into the bias suplly to get into proper range.

Good luck! It's a great little amp. :D :D :D


http://diy-tubes.com/image/cache/data/t ... 00x500.jpg

]



Beemer,

Thanks for the info on the tubes, Wish I knew as much as you do about them.

I have seen another post somewhere about the 20/20/20 in Princetons, so I wasn't surprised.

I was already planning on replacing ALL of the 'lytics, and the power tubes. Just can't bring myself to have anything "Radio Shack" in a vintage amp. :lol: I'll probably replace all the tubes and keep these for posterity.

I think it will be a great little amp again, the tolex is in pretty good shape, hopefully it and the grill cloth will clean up some. A new handle will also be in order, the original is not looking to good, and I don't trust it.

Bill

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Post subject: Re: Multi- cap cans
Posted: Sun Jan 05, 2014 2:23 pm
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vinyl wrote:
I think it will be a great little amp again, the tolex is in pretty good shape, hopefully it and the grill cloth will clean up some. A new handle will also be in order, the original is not looking to good, and I don't trust it.


+1

Keep the original handle hardware and merely replace the leather strap. 409 spray cleaner works great on soiled Tolex and Nubtex. I favor Windex for cleaning stained grill cloth. Remove the speaker, take the baffle board out of the cabinet, then spray and wipe. Rinse with distilled water applied via a spritzer bottle. Repeat the steps as necessary then allow to air-dry.

Arjay

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Post subject: Re: Multi- cap cans
Posted: Sun Jan 05, 2014 3:45 pm
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Retroverbial wrote:

PM sent.

Arjay


Email sent, may have wound up in your junk folder or spam filter.

Bill

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Post subject: Re: Multi- cap cans
Posted: Sun Jan 05, 2014 6:02 pm
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BTW... that is the original RCA 5Y3GT rectifier (17th week, 1961 manufacturer date). Yup, they don't make tubes like they use to...

:D :mrgreen: :D


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Post subject: Re: Multi- cap cans
Posted: Sun Jan 05, 2014 11:03 pm
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vinyl wrote:
Email sent, may have wound up in your junk folder or spam filter.


Got it -- reply sent.

Arjay

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Post subject: Re: Multi- cap cans
Posted: Sun Jan 05, 2014 11:05 pm
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BMW2002Ti wrote:
BTW... that is the original RCA 5Y3GT rectifier (17th week, 1961 manufacturer date). Yup, they don't make tubes like they use to...


+1000

I have several RCA's plus a few CBS-Hytrons. Beautiful bottles, built to last!

Arjay

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Post subject: Re: Multi- cap cans
Posted: Mon Jan 06, 2014 11:55 am
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Retroverbial wrote:
I've had extremely good luck with the CE cap cans as replacements for Champs and Princetons. Most measured close to dead-nuts accurate specs prior to installation and thus far they've proven to be pretty durable.

This one should work perfectly in your 6G2......

(leave the 10ufd section unused).

Note that the VDC rating is 475 -- a skosh higher than the Princeton schematic specifies but it will better tolerate today's higher wall-socket voltages. Your 5Y3 will be fine.

Arjay

You can get 20/20/20uf 525VDCmulti section cap from CE but they have lower temp ratings then the Astron which are 85C

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Post subject: Re: Multi- cap cans
Posted: Sun Jan 12, 2014 7:58 pm
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cvilleira wrote:
You can get 20/20/20uf 525VDCmulti section cap from CE but they have lower temp ratings then the Astron which are 85C


cvillera,

Thanks, I noted the temperature rating, I think the 525 v ones will do fine. I was a little surprised by the other electrolytics though. Cathode bypass caps are 100 uFd :shock: that's a long way from 25 uFd. Bias supply is a 10 uFd cap instead of a 25 uFd., but I assume this is an example of how Leo used what was at hand instead. The point of a cathode bypass capacitor is to eliminate cathode degeneration, so I'm not worried. I've more or less decided to go with original values with replacement parts in the power supply, bypass and bias supply circuits, unless I hear strong arguments otherwise. My experience is almost 35 years in the rf world of things, though it's been a long time since tubes were even a consideration. The last piece of tube gear I worked on was a klystron equipped microwave radio sometime in the 90's, so I'm not afraid to admit I could be wrong about pretty much anything when it comes to guitar amps. That's why I'm pretty much in awe of the amount of experience available here from Arjay, Bmw2002i, Bluesky. aclempoppi, and others.

Thanks,
Bill

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Post subject: Re: Multi- cap cans
Posted: Sun Jan 12, 2014 8:22 pm
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Aspiring Musician
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vinyl wrote:
cvilleira wrote:
You can get 20/20/20uf 525VDCmulti section cap from CE but they have lower temp ratings then the Astron which are 85C


cvillera,

Thanks, I noted the temperature rating, I think the 525 v ones will do fine. I was a little surprised by the other electrolytics though. Cathode bypass caps are 100 uFd :shock: that's a long way from 25 uFd. Bias supply is a 10 uFd cap instead of a 25 uFd., but I assume this is an example of how Leo used what was at hand instead. The point of a cathode bypass capacitor is to eliminate cathode degeneration, so I'm not worried. I've more or less decided to go with original values with replacement parts in the power supply, bypass and bias supply circuits, unless I hear strong arguments otherwise. My experience is almost 35 years in the rf world of things, though it's been a long time since tubes were even a consideration. The last piece of tube gear I worked on was a klystron equipped microwave radio sometime in the 90's, so I'm not afraid to admit I could be wrong about pretty much anything when it comes to guitar amps. That's why I'm pretty much in awe of the amount of experience available here from Arjay, Bmw2002i, Bluesky. aclempoppi, and others.

Thanks,
Bill


:roll: Crap, forgot to mention stratele52, there is no substitute for experience, IMHO

Bill

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Post subject: Re: Multi- cap cans
Posted: Sun Jan 12, 2014 9:10 pm
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" I was a little surprised by the other electrolytics though. Cathode bypass caps are 100 uFd that's a long way from 25 uFd. Bias supply is a 10 uFd cap instead of a 25 uFd., but I assume this is an example of how Leo used what was at hand instead. "

I've never seen a stock original Fender amp with a 100 mfd cathode bypass cap on the gain stages. The purpose of which is also to enhance bass. So, 100 mfd maybe excessive bass = "farting." I would go back to the stock 25 mfd at 50 VDC rating (over the OEM 25 VDC).

10 mfd on the bias supply is too little. This also, does not seem to be OEM. I use a 50 mfd, or higher mfd up to 100 mfd at 100VDC or more rating. Greater mfd will give you better filtering. Low value capacitance is not as critical, as the rectification for the bias supply is a simple half-wave, single solid-state diode. Just don't make it too big (like 200+ mfd) so that the bias supply is lagging behind the main PSU during transients.

Good luck!


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