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Old 19th March 2004, 05:25 AM   #1
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Default PL504 circuits.

I have some PL504's. Except for some mention that these could be used in an OTL, I couldn't find any circuits on the web.

Would anyone be able to suggest the best application for this tube. Are there any published circuits for an OTL using these tubes?
Thanks,
Ashok.
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Old 19th March 2004, 01:36 PM   #2
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Default PL504

I believe the Graff uses 20 PL504 in the O/P OTL style!

Guess any pentode style otl, like the Allan Kimmel OTL should work fine, so long as the operating point is chosen carefully
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Old 19th March 2004, 01:47 PM   #3
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Hi,

Quote:
I believe the Graff uses 20 PL504 in the O/P OTL style!
Actually only 12 of them in the GM100TL and 32 of them in the GM200.

As for actual circuits using these...never seen any.

Cheers,
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Old 21st March 2004, 07:19 PM   #4
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Default PL504

32 x PL504, I hope thats a stereo amp!! Could you imagine two monoblocks with that lot on!--Does the National Grid supply special 3 phase installations for these amps!!
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Old 21st March 2004, 11:35 PM   #5
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Hi,

Quote:
Could you imagine two monoblocks with that lot on!
Imagine....errrr, yes....provided someone else is prepared to foot the electricity bill.

The GM 200 are stereo amps, 800 Watt power consupmtion idle, 1600 Watt at full flight.

Mind you, mine aren't too far off.

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Old 21st March 2004, 11:59 PM   #6
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Braun CSV-60 used those tubes.
My friend has one,made in 1957.Sounds quite good.
It is push-pull design,just one pair for each channel.
As I recall ECC83 is a driver tube.

I think I have PDF with schematics of this amp.

Bartek
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Old 22nd March 2004, 12:11 AM   #7
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Default A circuit at last !

Hi Bartek,
I would really like to have that circuit. Would be really grateful if you could email it to me.
Thanks,
Ashok.
amadhavan(at)eth.net
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Old 22nd March 2004, 12:15 AM   #8
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Hi,

The AudioXpress issue of january 2002 describes a PP amp using PL504s as well.

I'm sure there must be quite a few others as well...

Cheers,
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Old 24th May 2004, 05:51 AM   #9
Jarin is offline Jarin  Czech Republic
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Default new amp with PL504...

Does anyone knows schematics with PL504 PCL85.
Ihave got them many but i don´t know how to use them in practice.




Jarin
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Old 24th May 2004, 09:20 AM   #10
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Quote:
Braun CSV-60 used those tubes.
My friend has one,made in 1957.Sounds quite good.
It is push-pull design,just one pair for each channel.
As I recall ECC83 is a driver tube.

I think I have PDF with schematics of this amp.
Do you still have the schematic?
If you do, then may I please have a look at it via email?

Thanks!
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