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Post subject: Re: Deluxe Reverb Silverface - No Sound
Posted: Sat Nov 16, 2013 7:26 pm
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Retroverbial wrote:
DBerti wrote:
Yes, I drained the filter caps again after my test. :-) )


What on earth for?

:shock:

The train long ago left the depot.

Arjay


How's that.]? I re-powered the amp and that re-charged the caps, right? Prior to me draining them they were reading over 450.


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Post subject: Re: Deluxe Reverb Silverface - No Sound
Posted: Sat Nov 16, 2013 7:41 pm
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You only need to discharge the caps when necessary, such as when you are going to get into the circuit for static tests of components, in which case you want no voltage present. The caps do not need to be discharged for checking voltages, changing tubes, setting the bias or other routine maintenance.

Yes, you want all tubes in place when checking voltages. 461 VDC seems quite high for a DR, but would at least indicate a working rectifier tube. What rectifier tube is installed?

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Last edited by shimmilou on Sat Nov 16, 2013 8:21 pm, edited 1 time in total.

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Post subject: Re: Deluxe Reverb Silverface - No Sound
Posted: Sat Nov 16, 2013 7:48 pm
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Has the power tranny been replaced? Sounds like a Mercury Magnetic PT. These are often wound with heavier wire and use more iron lammies. Result is a higher unloaded B+.

This is ok, as long as you use a 6V6GT that can handle +450VDC. The only new manufactured type is the JJ 6V6S, as far as I know. NOS 6V6GT types that can handle +450VDC are the 6V6GTY and the 6V6GTA. And adjust the bias to around 10-watts per tube.

Best GYT = Raytheon, brown based 6V6GTY. Best GTA = Tungsol black plate 6V6GTA.


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Post subject: Re: Deluxe Reverb Silverface - No Sound
Posted: Sat Nov 16, 2013 8:11 pm
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shimmilou wrote:
You only need to discharge the caps when necessary, such as when you are going to get into the circuit for static tests of components, in which case you want no voltage present. The caps do not need to be discharged for checking voltages, changing tubes, setting the bias or other routine maintenance.

Yes, you want all tubes in place when checking voltages. 461 VDC seems a bit high for a DR, but would at least indicate a working rectifier tube. What rectifier tube is installed?


Rectifier is: Mullard GZ34


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Post subject: Re: Deluxe Reverb Silverface - No Sound
Posted: Sat Nov 16, 2013 8:29 pm
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BMW2002Ti wrote:
Has the power tranny been replaced? Sounds like a Mercury Magnetic PT. These are often wound with heavier wire and use more iron lammies. Result is a higher unloaded B+.

This is ok, as long as you use a 6V6GT that can handle +450VDC. The only new manufactured type is the JJ 6V6S, as far as I know. NOS 6V6GT types that can handle +450VDC are the 6V6GTY and the 6V6GTA. And adjust the bias to around 10-watts per tube.

Best GYT = Raytheon, brown based 6V6GTY. Best GTA = Tungsol black plate 6V6GTA.


Don't recall transformer being replaced but I have had the amp for 20+ years and it could have somewhere along the way and I may not be remembering it. The stamp on the top says: 025130 and under that: -606-8-02. Does that help? The tubes are RCA 6v6GTA's


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Post subject: Re: Deluxe Reverb Silverface - No Sound
Posted: Sat Nov 16, 2013 8:35 pm
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While you guys are thinking about and responding to my latest posts I have one more question. I have also read that the way I am to test the plate voltage is with my meter set to DC Volts and 200m. Just to be safe (for my meter) I started at the 600 setting and had planned to work my way down. But I got the 461 at that setting. Isn't that 461 VOLTS...not millivolts? If I use the 200m setting won't that blow the fuse in my meter?
What am I missing?


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Post subject: Re: Deluxe Reverb Silverface - No Sound
Posted: Sat Nov 16, 2013 8:54 pm
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The P/N "025130" correlates to the power tranny used in a Deluxe, Deluxe Reverb, or Tremolux. Not the correct iron for a Princeton Reverb.

Arjay

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Post subject: Re: Deluxe Reverb Silverface - No Sound
Posted: Sat Nov 16, 2013 9:31 pm
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DB, 600VDC scale is fine for this test. But I'd set the meter at it's max A(10 amps or whatever). If your AC wall voltage is 127 AC volts, like mine, and you're using a strong Mullard GZ34, the readings aren't that far off. But what kind of current are the power tubes conducting at idle? Have you run any static tests on the output trans? I take that back, sort of, Stratele already touched on that subject. To back-up, Shimmy asked about the phase inverter tube. Has any testing or tube swapping been done on that account? Art

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Post subject: Re: Deluxe Reverb Silverface - No Sound
Posted: Sat Nov 16, 2013 9:40 pm
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Retroverbial wrote:
The P/N "025130" correlates to the power tranny used in a Deluxe, Deluxe Reverb, or Tremolux. Not the correct iron for a Princeton Reverb.

Arjay


This is a Deluxe Reverb. 68 Silverface


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Post subject: Re: Deluxe Reverb Silverface - No Sound
Posted: Sat Nov 16, 2013 9:45 pm
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aclempoppi wrote:
DB, 600VDC scale is fine for this test. But I'd set the meter at it's max A(10 amps or whatever). If your AC wall voltage is 127 AC volts, like mine, and you're using a strong Mullard GZ34, the readings aren't that far off. But what kind of current are the power tubes conducting at idle? Have you run any static tests on the output trans? I take that back, sort of, Stratele already touched on that subject. To back-up, Shimmy asked about the phase inverter tube. Has any testing or tube swapping been done on that account? Art


Rectifier is: Mullard GZ34 No testing or swapping. I have one on order but it has not arrived yet.


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Post subject: Re: Deluxe Reverb Silverface - No Sound
Posted: Sat Nov 16, 2013 10:05 pm
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DBerti wrote:
Retroverbial wrote:
The P/N "025130" correlates to the power tranny used in a Deluxe, Deluxe Reverb, or Tremolux. Not the correct iron for a Princeton Reverb.

Arjay


This is a Deluxe Reverb. 68 Silverface


Duh!

My bad......disregard.

:oops:

Arjay

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Post subject: Re: Deluxe Reverb Silverface - No Sound
Posted: Sat Nov 16, 2013 10:06 pm
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Have you tried your meter on a known high DC voltage source? Maybe it needs alignment. You should not be getting +450VDC from a DR PT rectified with a GZ34. Not at the anode of the 6V6GTs. Maybe, just maybe, at the first filter stage (right at the junction of the two 16mfd caps at the standby --- with the switch in "standby").


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Post subject: Re: Deluxe Reverb Silverface - No Sound
Posted: Sat Nov 16, 2013 11:30 pm
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Steve, I'm with you on that plate voltage, unless the tubes are drawing very little current. And the meter... what are you using, DB? Did I miss the bias current? And are we measuring this with a trans shunt method or what? And of course DB, I was lame enough not to mention the need of cleaning each pot, jack, and tube socket with a quality deox- shield cleaner. Have you tried throwing in the 6L6's ? And swapping the V1 with V6 ? and trying the Vib channel ? Oh yeah, until you get the electronic cleaner, give every control a 4-5 (X) rotation, just to push any dirt out of the way. Be Safe!!!! Art

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Post subject: Re: Deluxe Reverb Silverface - No Sound
Posted: Sun Nov 17, 2013 8:49 pm
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aclempoppi wrote:
Steve, I'm with you on that plate voltage, unless the tubes are drawing very little current. And the meter... what are you using, DB? Did I miss the bias current? And are we measuring this with a trans shunt method or what? And of course DB, I was lame enough not to mention the need of cleaning each pot, jack, and tube socket with a quality deox- shield cleaner. Have you tried throwing in the 6L6's ? And swapping the V1 with V6 ? and trying the Vib channel ? Oh yeah, until you get the electronic cleaner, give every control a 4-5 (X) rotation, just to push any dirt out of the way. Be Safe!!!! Art


The meter is a Sperry DM 350A - all around generic meter. I haven't gotten the bias current yet. I don't have a bias probe and was working my way to calculating the current when I got the unusually high plate voltage. btw...prior to starting this tread I did clean all tube sockets and switched out the pre-amp tubes (don't have replacement power tubes...have some ordered) Now... the latest. So, while poking around later last night checking other voltages just out of curiosity... all of a sudden I started hearing the white noise that sounded like a working amp. So, I turned up the volume and strummed the guitar and sure enough...the amp is now working. This gives me little relief because I still don't know what the problem was or when it will occur again. I had the amp chassis out and inverted in a test stand I made. It had not been moved for days so its not like something got bumped and that caused it to started working. The amp chassis was sitting there perfectly still - nothing was changed. I was just touching contact points to read voltages on various tube pins. So, I'm clueless as to why it just started working. Does anyone have any ideas? Thanks again for all of your input.


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Post subject: Re: Deluxe Reverb Silverface - No Sound
Posted: Sun Nov 17, 2013 9:21 pm
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You might try loosening the eyelet board from the chassis and inspecting the underside to ascertain if one of the solder points is contacting the steel chassis itself and grounding out a signal or a critical voltage. Do the same for the bias supply's tag board. The phenomenon is not common but I've seen it occur a time or two.

Arjay

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