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Post subject: solid state diode addition for today's GZ34/5AR4
Posted: Sat Sep 19, 2015 4:18 pm
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From Dynaco DIY site:

http://dynacotubeaudio.forumotion.com/t ... -diode-mod


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Post subject: Re: solid state diode addition for today's GZ34/5AR4
Posted: Sun Sep 20, 2015 12:22 pm
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Beemer...Why? My favorite amps all have GZ34 Rectifiers!

:shock:

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Post subject: Re: solid state diode addition for today's GZ34/5AR4
Posted: Sun Sep 20, 2015 5:30 pm
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Stratman, This is for those that use today's GZ34/5AR4, not yesterday's well-made Mullard or GE's tubes. Specially, the Sovtek or Chinese Shuguang, known for flash-over.


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Post subject: Re: solid state diode addition for today's GZ34/5AR4
Posted: Sun Sep 20, 2015 6:08 pm
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BMW2002Ti wrote:
Stratman, This is for those that use today's GZ34/5AR4, not yesterday's well-made Mullard or GE's tubes. Specially, the Sovtek or Chinese Shuguang, known for flash-over.


Correct.

Quality glass like these need no such "assistance"......

Image

Arjay

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Post subject: Re: solid state diode addition for today's GZ34/5AR4
Posted: Sun Sep 20, 2015 8:20 pm
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This has nothing to do with protecting the tube rectifier, it is to protect the amp in case the tube rectifier shorts. I don't believe that any brand of tube is bullet proof. All tubes can fail, and putting these diodes in place in case of tube failure would be a wise move.

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Post subject: Re: solid state diode addition for today's GZ34/5AR4
Posted: Mon Sep 21, 2015 11:17 am
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shimmilou wrote:
This has nothing to do with protecting the tube rectifier, it is to protect the amp in case the tube rectifier shorts. I don't believe that any brand of tube is bullet proof. All tubes can fail, and putting these diodes in place in case of tube failure would be a wise move.

I agree! I have RCA 5Y3 glass and my 5E3 has had the 1N4007s for some time. Protection is wise!

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Post subject: Re: solid state diode addition for today's GZ34/5AR4
Posted: Tue Sep 22, 2015 4:39 pm
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Retroverbial wrote:
BMW2002Ti wrote:
Stratman, This is for those that use today's GZ34/5AR4, not yesterday's well-made Mullard or GE's tubes. Specially, the Sovtek or Chinese Shuguang, known for flash-over.


Correct.

Quality glass like these need no such "assistance"......

Image

Arjay


Thanks for the clarification Beemer!

Arjay...those two brought a tear to my eye! So pretty, so perfect!

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Post subject: Re: solid state diode addition for today's GZ34/5AR4
Posted: Wed Sep 23, 2015 12:01 am
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Cap47 wrote:
shimmilou wrote:
This has nothing to do with protecting the tube rectifier, it is to protect the amp in case the tube rectifier shorts. I don't believe that any brand of tube is bullet proof. All tubes can fail, and putting these diodes in place in case of tube failure would be a wise move.

I agree! I have RCA 5Y3 glass and my 5E3 has had the 1N4007s for some time. Protection is wise!


I notice that Fender put these diodes in at the factory, on the circuit board, for the 59 Bassman RI. I am not sure if they have done the same for any other amps. :?:

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Post subject: Re: solid state diode addition for today's GZ34/5AR4
Posted: Wed Sep 23, 2015 12:44 am
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shimmilou wrote:
I notice that Fender put these diodes in at the factory, on the circuit board, for the 59 Bassman RI. I am not sure if they have done the same for any other amps. :?:


I don't see any evidence of those diodes on the schematics for the DRRI or the '68 CDR, at least not yet.

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Post subject: Re: solid state diode addition for today's GZ34/5AR4
Posted: Fri Sep 25, 2015 12:00 am
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Yeah, the Bassman RI is the only one I've noticed so far.

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Post subject: Re: solid state diode addition for today's GZ34/5AR4
Posted: Fri Sep 25, 2015 2:36 am
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Anybody looked under the hood of a Super Reverb re-issue or the custom-shop 5E3 tweed Deluxe lately?

Arjay

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Post subject: Re: solid state diode addition for today's GZ34/5AR4
Posted: Sat Sep 26, 2015 1:13 pm
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The '57 Deluxe has the diodes too.

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Post subject: Re: solid state diode addition for today's GZ34/5AR4
Posted: Sat Sep 26, 2015 5:29 pm
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I've worked on a couple of Mission Amps that had inline diodes with the 5AR4. 6L6GC 30-40 watt amps, IIRC.


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Post subject: Re: solid state diode addition for today's GZ34/5AR4
Posted: Mon Sep 28, 2015 11:35 am
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Well since my 69 super reverb had to go to the tech, I showed him this mod, he looked at the copy I made, than he mentioned somebody's name and said he knows this hand writing, and yes this should be done he said, than he went into using UF4007 instead, but this will cost 60 cent compared to 5 cent for the IN4007, I told him I can afford the extra money :lol: if he has one in stock.
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