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Old 22nd January 2012, 09:11 PM   #41
pilovis is offline pilovis  Italy
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The prototype on the youtube clips uses two line transformer 220V/24V 40VA as output transformers
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Old 22nd January 2012, 09:18 PM   #42
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by pilovis View Post
The prototype on the youtube clips uses two line transformer 220V/24V 40VA as output transformers
Thank's..might try the mozener in the cathode bias circuit...

I'll have a think and see what happens

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Old 22nd January 2012, 09:48 PM   #43
pilovis is offline pilovis  Italy
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Originally Posted by M Gregg View Post
Thank's..might try the mozener in the cathode bias circuit...

I'll have a think and see what happens

Regards
M. Gregg
Could you please give me more details about mozener?
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Old 25th January 2012, 01:31 PM   #44
pilovis is offline pilovis  Italy
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Audio test of PL504 @ 35Vcc with line trasformer 220/24V as output transformer:

http://www.youtube.com/watch?v=V1F7q...layer_embedded

Preamp = 1/2 ECC82
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Old 24th July 2013, 10:46 AM   #45
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hello ,

me copy your build , up to élévate HT to 150 V= or upgrad to 250 V=

you are no tested to big voltage ?
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Old 24th July 2013, 10:50 AM   #46
pilovis is offline pilovis  Italy
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You can increase anode voltage up to 160 Vcc without any problem, just adapt electrolitics capacitors voltage.
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Old 24th July 2013, 10:56 AM   #47
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Quote:
Originally Posted by pilovis View Post
You can increase anode voltage up to 240 Vcc without any problem, just adapt electrolitics capacitors voltage.
hello ,

i me tested to build , and me problem for use transformator adapted to impédance audio !

me old build , so risk no assymétric audio and build CR for good appréciate music ?
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Old 24th July 2013, 11:08 AM   #48
pilovis is offline pilovis  Italy
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Quote:
Originally Posted by jean michel View Post
hello ,

i me tested to build , and me problem for use transformator adapted to impédance audio !

me old build , so risk no assymétric audio and build CR for good appréciate music ?
If you increase PL504 anode voltage above 90V, you should use real audio output transformers (600-800 ohm) instead of using the line transformers as I suggested for the 24 Vcc prototype.
Audio transformers improve bandwith and also limit the risk of core saturation due to c.c.

Last edited by pilovis; 24th July 2013 at 11:25 AM.
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Old 24th July 2013, 11:15 AM   #49
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Originally Posted by pilovis View Post
If you increase PL504 anode voltage above 90V, you should use real audio output transformers (800 ohm) instead of using the line transformers as I suggested for the 24 Vcc prototype.
Audio transformers improve bandwith and also limit the risk of core saturation due to c.c.
okey , thank
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Old 24th July 2013, 11:24 AM   #50
pilovis is offline pilovis  Italy
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This one could be OK.

TU020

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