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In Reply to: RE: Sheesh, what does it matter? Everyone I know states 6L6 sounds better than EL34,I DON'T believe in coincidence posted by Cleantimestream on February 22, 2015 at 12:21:43
nada aqui
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Buy Chinese. Bury freedom.
Follow Ups:
TK
CAUTION
You are starting to sound like a troll.
DanL
No, you just didn't get it. The sound of an amplifier is the product of many things. OPTs, coupling caps, class of operation, driver and output stage operating conditions, power supply, brands and conditions of tubes, etc., etc. I don't believe anyone can say 6L6 amplifiers categorically sound better then EL34s, and I was surprised that you said otherwise as though it's a fact. I'm not criticizing your opinion, but that's all it is - an opinion. Anyway, your inability to reference an authoritative source for this clarifies the issue for me. No need to drag it out.
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Buy Chinese. Bury freedom.
This is true BUT ...
You will never get a 4 cylinder VW engine
sound anything like the Viper V10.
And you will never get an EL84 amp
sound anything like a KT88 amp.
Tube choice IS the main factor in amp sound.
All other factors influence the sound
but tube choice is the building block.
DanL
I stick with Thoriated, DH tubes...unfortunately there are no DH tubes with the characteristics of the TV horizontal outputs, and those can sound quite good. 25 watt plates wrapped around a 2.5A cathode are not to be despised....and EL84's make fine signal tubes...:)
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
so, I was reading the 3rd edition Radiotron book last night wherein they mention an expensive way to sidestep using feedback for a push/pull Pentode/beam tetrode by redesigning the output transformer... Is that what your latest 813 schemo entails?
The Mind has No Firewall~ U.S. Army War College.
I should look for that, have you a page number?
I do doubt it is what I am running, that being the E-Linear circuit with a LTP attached to 20 or 30% U-L taps on the plate winding. The 813's are going to get replaced with the original 4E27, and whilst I am under the hood, the 6H6Pi-under-FQP1N60 cascode is going to get replaced with a pair of EL84's.
That deals with output Z nicely; the local FB drops the plate Z of the pentodes nicely...which also benefits the low end response. Will probably hook the final's g2 to 20% and the front end LTP to 30%.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Page 40, under the heading "Application of Negative Feedback"
The Mind has No Firewall~ U.S. Army War College.
I guess I need to find a copy of Radiotronics 76( 26th May, 1937), pages 42-44...:)
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
I didn't have that one either Douglas.
The flywheel discourse DID remind me ... when reading these REAL old Ham books... that the use of three chokes in series {do not recall anything else} could slightly increase the B+. Had I been further along in learning I would have been far more interested, than I was @ the time.
The Mind has No Firewall~ U.S. Army War College.
Looks like a fun treasure hunt; I'd not mind seeing what they are talking about.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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