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Old 11th June 2004, 02:44 PM   #1
jogas is offline jogas  Italy
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Default ppp el84 fixed bias schematics

Hello everybody,

I am new in this forum and I would like to ask you for any site where I can find a ppp el84 schematic, (hopefully with a fixed bias) or a schematic of any famous brand like beard or manley with their multi parallel el-84 push pull...

Thanks in advance
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Old 11th June 2004, 08:03 PM   #2
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I am not a big fan of paralleled EL84s and would rather use a larger valve if more power is needed.
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Old 11th June 2004, 11:27 PM   #3
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Quote:
Originally posted by analog_sa
I am not a big fan of paralleled EL84s and would rather use a larger valve if more power is needed.
Interesting. Can you recommend a euphonic pentode with plate dissipation comparable to paralleled KT90s at a B+ of 400V--say about 100W per tube? I need pentodes so I can switch between Ultralinear and Triode mode in my cathode-feedback design.

I just thought I'd ask.

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George Ferguson
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Old 11th June 2004, 11:38 PM   #4
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Hi,

Quote:
I just thought I'd ask.
Anything else on that wishlist, George?

Penthodes like that exist but think B+ in the order of 1KV and higher.

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Old 12th June 2004, 02:59 AM   #5
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Quote:
Anything else on that wishlist, George?
Oh yeah, plenty. But none I can share in polite company.

Out of curiosity, what are your favorite / most euphonic big penthodes (100W+ plate dissipation)? Are any in current production?

A guy can dream, can't he?

Thanks,

George "Oooh, Nice Tubes!" Ferguson
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Old 12th June 2004, 03:06 AM   #6
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Hi,

Quote:
Out of curiosity, what are your favorite / most euphonic big penthodes (100W+ plate dissipation)? Are any in current production?
I'm afraid I never went down that road.

Quote:
A guy can dream, can't he?
Cetainly....not that I would dream about those big bottles but, why not?

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Old 12th June 2004, 03:54 PM   #7
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Thanks for the reply Frank--just curious.

Quote:
not that I would dream about those big bottles
Fair enough--that is a path (100W pentodes) that I don't actually plan to pursue. Consider it the fleeting fantasy of a thermionic adolescent. My inexperienced hormones respond to anything that glows.

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George "I Swear, I Never Inhaled!" Ferguson
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Old 12th June 2004, 04:35 PM   #8
Fuling is offline Fuling  Sweden
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Quote:
big penthodes (100W+ plate dissipation)? Are any in current production?
813
Still being made in China but NOS quality brands are cheap and easy to find.
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Old 13th June 2004, 01:13 AM   #9
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Thank you Sir!

Wow!

The data sheet alone is fearsome!
2KV, 100W plate dissipation, 5 amp filament...

Wow!

Thanks again,

George "We Now Return You To Your Thread, Which is Already In Progress" Ferguson
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Old 13th June 2004, 01:29 AM   #10
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Hi,

Not that it matters much but the 813 is a beam tetrode.

The nicest sample I've seen so far was a TT10, a Marconi equivalent.

Errr....George, this is just a dream, right?
We'd like to have you around for a long time...at 2.5KV it only takes a split second and it's not even

Careful,
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