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Old 10th January 2007, 02:34 AM   #1
nhuwar is offline nhuwar  United States
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Default Tetrode output stage

I'm wondering is there a specific problem in using tetrode for audio power amp tube. I've been looking around and havn't seen any????????

Nick
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Old 10th January 2007, 02:41 AM   #2
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You won't find any. The plain tetrode suffers from secondary emission that puts a 'kink' in the plate current / voltage curve at low plate voltages. This was cured by adding either a beam plate (to make a beam tetrode, e.g. 6V6, 6L6, 807, 6550, KT66, KT77, KT88, KT90) or a third grid (to make a pentode, e.g. EL84, EL34). All multigrid output tubes are either beam tetrodes or pentodes.
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Old 10th January 2007, 04:34 AM   #3
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Hi nhuwar , Hi ray moth ,

There is ( or there was ) a very interesting PURE
TETRODE made for AF Class AB1 or AB2 amplifier .
( among many uses ) .

It have two PURE TETRODES into the same envelope ,
made initially by Telefunken , I never see it , anytime ,
in any place , but I have two NOS of them on my shelf .

Donít ask me about the sound quality , because I didnít
build anything with us .

The two PURE TETRODES into the same envelope , allow
us to build a push-pull amplifier , with only ONE tube at the
output .

More information on the FRANKís site Ė code # 6360
See page 5 of Telefunken 6360 datasheet .
Interesting to see and to know !!

Regards ,

Carlos
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Old 10th January 2007, 04:37 AM   #4
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OOOps , sorry , sorry !!

........ I didn't build anything with THEM .

Carlos
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Old 10th January 2007, 11:00 AM   #5
EC8010 is offline EC8010  United Kingdom
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Although it doesn't explicitly say so, 6360 is a beam tetrode. You can tell from the anode curves and the symbols used on the pin-out hint at it.
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Old 10th January 2007, 12:09 PM   #6
SY is offline SY  United States
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Quote:
Originally posted by EC8010
Although it doesn't explicitly say so, 6360 is a beam tetrode.
Impure! Impure!
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Old 10th January 2007, 01:51 PM   #7
nhuwar is offline nhuwar  United States
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So in other word's it would pretty much be a futile attempt to use tetrode.
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Old 10th January 2007, 03:30 PM   #8
Klimon is offline Klimon  Belgium
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I asked the same question a while back: TETRODE amplifiers

Simon
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Old 10th January 2007, 04:00 PM   #9
nhuwar is offline nhuwar  United States
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I think it would make my life easier if I just use 2 triode. Plus there actually cheaper then the tetrodes. I've found a matching pair for $220 verses $250 each for the tetrodes.
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Old 10th January 2007, 06:07 PM   #10
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Quote:
Originally posted by EC8010
Although it doesn't explicitly say so, 6360 is a beam tetrode. You can tell from the anode curves and the symbols used on the pin-out hint at it.

Hi EC 8010 ,

Are you sure about that ???

Iím not sure , because over the entire bibliography available ,
the 6360 tube is mentioned and explicited how being a pure
tetrode , without beam plates or other tricks .

I , really , donít want to broke the envelope of my NOS 6360
to confirm who has the reason !!! Or , if it is ďimpureĒ as
SY said !!!

Regards ,

Carlos
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