| jogas |
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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| analog_sa |
| 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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| DrDeville |
| 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. :)
Best,
George Ferguson |
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| fdegrove |
Hi,
| quote: | | I just thought I'd ask. |
Anything else on that wishlist, George?:D
Penthodes like that exist but think B+ in the order of 1KV and higher.
Cheers,;) |
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| DrDeville |
| quote: | | Anything else on that wishlist, George? :D |
Oh yeah, plenty. But none I can share in polite company. :bigeyes: :forbiddn: ;)
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? :drool: :happy2:
Thanks,
George "Oooh, Nice Tubes!" Ferguson |
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| fdegrove |
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?
Cheers, ;) |
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| DrDeville |
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. :D
Best,
George "I Swear, I Never Inhaled!" Ferguson |
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| Fuling |
| 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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| DrDeville |
Thank you Sir! :)
Wow!:eek:
The data sheet alone is fearsome!
2KV, 100W plate dissipation, 5 amp filament...
Wow! :hot:
Thanks again,
George "We Now Return You To Your Thread, Which is Already In Progress" Ferguson |
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| fdegrove |
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,;) |
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| DrDeville |
| quote: | | Not that it matters much but the 813 is a beam tetrode. |
Pentode, penthode, tetrode--I'd be just as dead either way, right? ;)
| quote: | | Errr....George, this is just a dream, right? |
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 |
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| RE 604 |
Hello ,
donīt forget the Siemens RS 1003 and itīs 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 . |
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| Fuling |
Just to mention it: 813 has really nice curves when hooked up as triodes.
Iīm giong to run mine in SE at 900V 80mA into 9,2k and Iīm expecting almost 27W if I can push the grid to +20V (which shouldnīt be much of a problem since it draws a very moderate grid current) |
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| DrDeville |
Many thanks for the info, guys. I don't have enough experience yet to develop prejudices for or against any type of tube. :)
And nice site RE--nice tube photos. :up:
Best,
George "I Like To Watch" Ferguson |
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| jueic |
Folks,
This aussie tube might be a good starting point to make your dream comes true.
http://cgi.ebay.com.au/ws/eBayISAPI...5704132833&rd=1
It even comes with a chair, so you can sit down and relax after you hook up all the circuit.
Be quick !! Bid ends in 5 days.
JueiC |
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| DrDeville |
Thanks JueiC,
That put a big smile on my face. :D
Best,
George "The Mighty OZ Has Spoken!" Ferguson |
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| aurt |
JueiC,
Extremely cool. Have to love an electric octopus. |
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