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    Building, troubleshooting and testing of these amplifiers should only be
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    the safety precautions around high voltages.

ppp el84 fixed bias schematics

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J

jogas

Member
Joined 2004
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 :)
 
DrDeville

DrDeville

Member
Joined 2004
analog_sa said:
I am not a big fan of paralleled EL84s and would rather use a larger valve if more power is needed.
Click to expand...

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. :)

Best,

George Ferguson
 
DrDeville

DrDeville

Member
Joined 2004
Thanks for the reply Frank--just curious.

not that I would dream about those big bottles
Click to expand...

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. :D

Best,

George "I Swear, I Never Inhaled!" Ferguson
 
fdegrove

fdegrove

diyAudio Senior Member
Joined 2002
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 :RIP: not even :wchair:

Careful,;)
 
DrDeville

DrDeville

Member
Joined 2004
Not that it matters much but the 813 is a beam tetrode.
Click to expand...

Pentode, penthode, tetrode--I'd be just as dead either way, right? ;)


Errr....George, this is just a dream, right?
Click to expand...

Frank!

You like me! You really like me! :hug:

Gee, considering my inexperience and my sense of humor, I thought you'd be encouraging me to test B+ with my tongue. :flame: :skull: :ghost:

Don't worry--I won't let it go to my head--I imagine you're simply a kind soul who avoids stepping on spiders, etc. ;)

Seriously, I thought my :eek: :hot: and "fearsome" were enough, but no, I am merely fantasizing. I have enough on my plate surviving my current project's 450V B+. And then there's making it actually sound good... :)

And the last time I even mentioned 1000V+ in a thought experiment, SY nearly b*tch-slapped me into next Tuesday. :fight:

Don't worry--if I'm going to risk my life at insanely high voltages, it will be for a triode. :joker:

Something like this:

http://www.nutshellhifi.com/VSAC2003-2.html

(I especially like the 2' long adjusting tool. :D )

Thanks for your concern.

Best,

George Ferguson
 
RE 604

RE 604

Member
Joined 2003
Hello ,
don´t forget the Siemens RS 1003 and it´s east european equivalent , the SRS 551 , cheap and easy to find on E - Bay Germany , only the sockets are a little bit rare .
Na~ 105 Watt
Ua 800 Volt
Ug2 380 Volt
Ia 200 mA

The next tube , I like much , is the YL 1350 from Telefunken , a modern tube and one of the latest works in the Ulmer factory .
You can see a picture from this tube on my homepage .
I plan , to build a SE amp with this tube .

You need only a maximum voltage from 800 V for this modern tubes , they are easy to drive and because they are longlife professional tubes , they last 10000 hours .

But I think , this is more an european project , because this tubes are not well known in the USA .
Kindly regards , Alex .
 
Fuling

Fuling

Member
Joined 2001
Just to mention it: 813 has really nice curves when hooked up as triodes.
I´m giong to run mine in SE at 900V 80mA into 9,2k and I´m expecting almost 27W if I can push the grid to +20V (which shouldn´t be much of a problem since it draws a very moderate grid current)
 
dady

dady

Member
Joined 2002
Dear friend, do you know how is the impedance of the transformer for use with a RS1003 and what about of its linearity? i like this tube but never hear one, i wanting to do an amp trying with screen exited and g1 to ground like tim de paravicini one but in pushpull for big power and DC coupled.
Best Regards
Esteban Bikic
dady@comodoro.com
 
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