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Post subject: DRRI- solid state rectifier
Posted: Mon Apr 22, 2013 12:31 pm
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Has anyone used this in place of the tube rectifier for a long time? I took mine out, partly because the pwr. tranny actually ran hotter at higher volumes. I had no doubt the JJ 6v6' could take the higher voltage, but it's the pwr.tranny/filter caps/other components that have me worried.
Someone should make the s.s. rectifiers so that you can plug a tube in, and the diodes would only kick in if the GZ34 shorts.........saving your fuse......or tranny.


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Post subject: Re: DRRI- solid state rectifier
Posted: Mon Apr 22, 2013 12:34 pm
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Did you bother to rebias the power tubes to compensate for the increased plate voltage?

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Post subject: Re: DRRI- solid state rectifier
Posted: Mon Apr 22, 2013 3:16 pm
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yomammaaho wrote:
Has anyone used this in place of the tube rectifier for a long time? I took mine out, partly because the pwr. tranny actually ran hotter at higher volumes.



Did the tranny run cooler now ? I guess not.

It is normal tranny get hot a high volume . Remove SS rectifier and put the tube. Be sure you have the proper fuse and play music.


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Post subject: Re: DRRI- solid state rectifier
Posted: Mon Apr 22, 2013 3:33 pm
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stratele52 wrote:
yomammaaho wrote:
Has anyone used this in place of the tube rectifier for a long time? I took mine out, partly because the pwr. tranny actually ran hotter at higher volumes.



Did the tranny run cooler now ? I guess not.

It is normal tranny get hot a high volume . Remove SS rectifier and put the tube. Be sure you have the proper fuse and play music.


+1

Leo never saw any potential for a problem -- neither have the thousands of satisfied Deluxe Reverbs owners since the amp was introduced fifty years ago.

I fail to see a reason why this "issue" should be revisited.

:roll:

Arjay

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Post subject: Re: DRRI- solid state rectifier
Posted: Mon Apr 22, 2013 3:42 pm
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Power transformer give power to the amp , Power mean heat dissipating . If not , amp will not work .......


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Post subject: Re: DRRI- solid state rectifier
Posted: Mon Apr 22, 2013 6:18 pm
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bluesky636 wrote:
Did you bother to rebias the power tubes to compensate for the increased plate voltage?

Yep. Rebiased .
I remember reading that not using your rectifier filament current tap raises your B+ enough to then stress the tranny in that regards. Although not red hot, I could barely hold my hand on the tranny for 10 seconds using the ss rectifier with high volume.


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Post subject: Re: DRRI- solid state rectifier
Posted: Mon Apr 22, 2013 6:27 pm
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Retroverbial wrote:
stratele52 wrote:
yomammaaho wrote:
Has anyone used this in place of the tube rectifier for a long time? I took mine out, partly because the pwr. tranny actually ran hotter at higher volumes.



Did the tranny run cooler now ? I guess not.

It is normal tranny get hot a high volume . Remove SS rectifier and put the tube. Be sure you have the proper fuse and play music.


+1

Leo never saw any potential for a problem -- neither have the thousands of satisfied Deluxe Reverbs owners since the amp was introduced fifty years ago.

I fail to see a reason why this "issue" should be revisited.
:roll:


Consider for a moment that new people enter the forum.
You remind me of the kind of $@!&# at an open jam who is self absorbed and "thinks" he knows everything.........until you make the mistake of running your mouth 1 time too many.......and GET straightened out like a coward deserves.
We've all seen the type.
Arjay


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Post subject: Re: DRRI- solid state rectifier
Posted: Mon Apr 22, 2013 6:42 pm
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"Coward"?

Uh......sure.

:roll:

You'd fare better trying to jack off a rabid bobcat with a fist full of carpet tacks while locked in a phone booth than to face me personally and hurl that appellation.

Arjay

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Post subject: Re: DRRI- solid state rectifier
Posted: Mon Apr 22, 2013 9:44 pm
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yomammaaho wrote:
bluesky636 wrote:
Did you bother to rebias the power tubes to compensate for the increased plate voltage?

Yep. Rebiased .
I remember reading that not using your rectifier filament current tap raises your B+ enough to then stress the tranny in that regards. Although not red hot, I could barely hold my hand on the tranny for 10 seconds using the ss rectifier with high volume.


That's BS. The B+ increases when using an SS rectifier because the SS rectifier is more efficient and doesn't suffer the voltage drop that a tube rectifier does. You never said whose SS rectifier you used, but I would be willing to bet it is a crap unit with nothing but diodes inside. SS rectifiers like the Weber Copper Top rectifiers are designed to more closely emulate the operation of the tube rectifier they are intended to replace. Yes, the B+ goes up a little, but not significantly. The 5F6A clone that I built offers the option of using either a 5AR4 or Copper Tube SS rectifier and even though the B+ went up with the Copper Top, the power tranny did not become overly hot. The Trainwreck Express clone I just finished uses four 1N5408 diodes for the rectifier and even though the power tranny has a 5 volt supply that is not used, the tranny does not get overly hot under normal playing conditions.

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Post subject: Re: DRRI- solid state rectifier
Posted: Mon Apr 22, 2013 9:45 pm
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yomammaaho wrote:
Consider for a moment that new people enter the forum.
You remind me of the kind of $@!&# at an open jam who is self absorbed and "thinks" he knows everything.........until you make the mistake of running your mouth 1 time too many.......and GET straightened out like a coward deserves.
We've all seen the type.


Except in this case, Arjay knows more about Fender amps than most anyone in this forum and definitely more than you can ever hope to know. :roll:

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Post subject: Re: DRRI- solid state rectifier
Posted: Mon Apr 22, 2013 9:46 pm
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Retroverbial wrote:
"Coward"?

Uh......sure.

:roll:

You'd fare better trying to jack off a rabid bobcat with a fist full of carpet tacks while locked in a phone booth than to face me personally and hurl that appellation.

Arjay


Well, first he has to learn how to properly quote someone in a forum. :lol: :lol: :lol: :lol:

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Post subject: Re: DRRI- solid state rectifier
Posted: Tue Apr 23, 2013 6:11 am
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bluesky636 wrote:
yomammaaho wrote:
Consider for a moment that new people enter the forum.
You remind me of the kind of $@!&# at an open jam who is self absorbed and "thinks" he knows everything.........until you make the mistake of running your mouth 1 time too many.......and GET straightened out like a coward deserves.
We've all seen the type.


Except in this case, Arjay knows more about Fender amps than most anyone in this forum and definitely more than you can ever hope to know. :roll:


Does'nt mean he's not a coward.
Just because he's supposedly discussed subject before, does'nt give him excuse to brush off questions with his twerpy little attitude.
Like I said.......He's too full of himself. Must've got turned down by a groupie lately.
Unlike him, I'd call him a twerp to his face.
Seen too many like him.


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Post subject: Re: DRRI- solid state rectifier
Posted: Tue Apr 23, 2013 6:19 am
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yomammaaho wrote:
bluesky636 wrote:
yomammaaho wrote:
Consider for a moment that new people enter the forum.
You remind me of the kind of $@!&# at an open jam who is self absorbed and "thinks" he knows everything.........until you make the mistake of running your mouth 1 time too many.......and GET straightened out like a coward deserves.
We've all seen the type.


Except in this case, Arjay knows more about Fender amps than most anyone in this forum and definitely more than you can ever hope to know. :roll:


Does'nt mean he's not a coward.
Just because he's supposedly discussed subject before, does'nt give him excuse to brush off questions with his twerpy little attitude.
Like I said.......He's too full of himself. Must've got turned down by a groupie lately.
Unlike him, I'd call him a twerp to his face.
Seen too many like him.


stratele52, Arjay, and I all design, build, and repair tube amplifiers. And your qualifications are what? :roll:

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Post subject: Re: DRRI- solid state rectifier
Posted: Tue Apr 23, 2013 7:53 am
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yomammaaho, seems like you have a current draw issue. The solid-state replacement rectifier, on it own, should not cause the PT to run hotter. Unless there is a short or some inherent issues with that replacement unit (like poor diodes used in that device or poor wiring).

You would think the amp would run slightly cooler with SS than with a GZ34/5AR4. No 5VAC load and no GZ34 heat makers.

There are ways to add SS-diodes to the pins of the 5AR4, that helps prolong the tube rectifier's life. But, you'll lose some of the tube tone.


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Post subject: Re: DRRI- solid state rectifier
Posted: Tue Apr 23, 2013 8:10 am
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BMW2002Ti wrote:
yomammaaho, seems like you have a current draw issue. The solid-state replacement rectifier, on it own, should not cause the PT to run hotter. Unless there is a short or some inherent issues with that replacement unit (like poor diodes used in that device or poor wiring).

You would think the amp would run slightly cooler with SS than with a GZ34/5AR4. No 5VAC load and no GZ34 heat makers.

There are ways to add SS-diodes to the pins of the 5AR4, that helps prolong the tube rectifier's life. But, you'll lose some of the tube tone.


My opinion also.

bluesky636 wrote:
yomammaaho wrote:
bluesky636 wrote:
Did you bother to rebias the power tubes to compensate for the increased plate voltage?

Yep. Rebiased .
I remember reading that not using your rectifier filament current tap raises your B+ enough to then stress the tranny in that regards. Although not red hot, I could barely hold my hand on the tranny for 10 seconds using the ss rectifier with high volume.


That's BS. The B+ increases when using an SS rectifier because the SS rectifier is more efficient and doesn't suffer the voltage drop that a tube rectifier does. You never said whose SS rectifier you used, but I would be willing to bet it is a crap unit with nothing but diodes inside. SS rectifiers like the Weber Copper Top rectifiers are designed to more closely emulate the operation of the tube rectifier they are intended to replace. Yes, the B+ goes up a little, but not significantly. The 5F6A clone that I built offers the option of using either a 5AR4 or Copper Tube SS rectifier and even though the B+ went up with the Copper Top, the power tranny did not become overly hot. The Trainwreck Express clone I just finished uses four 1N5408 diodes for the rectifier and even though the power tranny has a 5 volt supply that is not used, the tranny does not get overly hot under normal playing conditions.

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