subbing tube rectification for ss

for the DIY ST35, the Dynakit and every other PP EL84

subbing tube rectification for ss

Postby Stunch » Sat Dec 31, 2016 1:29 pm

Has anyone used a rectifier tube instead of SS rectification in their ST-35? I suppose you would need a higher rated PT to handle the added voltage drop, and need to keep the first cap under 50uF, but other than that, is it worth it?
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Re: subbing tube rectification for ss

Postby Geek » Sat Dec 31, 2016 2:39 pm

You'll have voltage drop, so use something with the lowest. GZ34, EZ81, etc. and use a seperate filament tranny.

Cheers!
-= Gregg =-
Fine wine comes in glass bottles, not plastic sacks. Therefore the finer electrons are also found in glass bottles.
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Re: subbing tube rectification for ss

Postby Stunch » Mon Jan 02, 2017 7:18 pm

There doesn't seem to be too much voltage drop with the GZ34, so maybe it could be used with the existing 330-0-330 PT.

B+ will be lower but maybe that's a good thing. Bias will need to be reset though.
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Re: subbing tube rectification for ss

Postby Geek » Mon Jan 02, 2017 8:37 pm

Stunch wrote: B+ will be lower but maybe that's a good thing.


Agreed.

Hafler had a habit of ramping things to "110%" with Dynaco. Sounded good, met specs, 70C. transformers were the norm and ate tubes like cereal ;)
-= Gregg =-
Fine wine comes in glass bottles, not plastic sacks. Therefore the finer electrons are also found in glass bottles.
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