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Old 12th August 2003, 12:05 AM   #1
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Default ESL amp with 1:4 stepup transformer

Dunno if I need to post hear at loudspeakers or tubes or both...

Anyway..can anyone tell me how I am doing?

Cheers,
Bas


http://home.zonnet.nl/horneman/eslamp.htm
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Old 12th August 2003, 02:27 AM   #2
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Hi Bas,
How would you maintain a constant plate loading?
I think you would need some kind of impedance compensation network.
Or maybe it`s not so importent?
There is another issue of high freq ringing that needs to be delt with,How do you plan to control the ringing?
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Old 12th August 2003, 12:34 PM   #3
316a is offline 316a  England
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Default Re: ESL amp with 1:4 stepup transformer

Quote:
Originally posted by Bas Horneman
Dunno if I need to post hear at loudspeakers or tubes or both...

Anyway..can anyone tell me how I am doing?

Cheers,
Bas


http://home.zonnet.nl/horneman/eslamp.htm
Hi Bas ,
Looks ok !
Just a few points of note :
Coupling caps may be too large (0.22uF will run full-range)
6EW7 may not have enough 'clout' to drive your panels loud enough

Hope this helps

316a
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Old 12th August 2003, 12:48 PM   #4
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Hi FB,

Quote:
Coupling caps may be too large (0.22uF will run full-range)
Yep, changed that to 0,056uF allready.

Quote:
6EW7 may not have enough 'clout' to drive your panels loud enough
Yes, I thing you are right...what were you going to use again?
EL36 or something?


I doubt the transformer as well by the way...

Cheers,
Bas
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Old 12th August 2003, 02:14 PM   #5
316a is offline 316a  England
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Default More ESL stuff

Quote:
Originally posted by Bas Horneman
Hi FB,


Yep, changed that to 0,056uF allready.



Yes, I thing you are right...what were you going to use again?
EL36 or something?


I doubt the transformer as well by the way...

Cheers,
Bas
Hi Bas ,
You could probably use an even smaller value for the couplers . Low value 1% toleranced Vishay polyprops are available very cheaply , the smaller the cap , the better if you ask me ! If using a low value , you could always just use the couplers as a simple 1st order crossover within the amplifier instead of an external one . The valves I was intending on using were EL38's , but these were for direct drive running at 480V as triodes . (EL38 have mu of 16 and Ra of 1.9k as triodes) However for step-up usage I would recommend a low Ra device such as 5998a , 6528 or triode strapped 12E1 , EL34 etc or better still a 2A3 . Mind you though , the 6EW7 would make an excellent starting point to build from ! Maybe not ear-splittingly-loud but there should be enough to get a working setup !

316a
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Old 12th August 2003, 02:35 PM   #6
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Quote:
just use the couplers as a simple 1st order crossover within the amplifier instead of an external one
Excellent idea!

Quote:
better still a 2A3
Yep, was thinking that too...like you said..the 6ew7 might be a good starting point..



Hi Ben,
Quote:
There is another issue of high freq ringing that needs to be delt with,How do you plan to control the ringing?
What do you mean?

Cheers,
Bas
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Old 13th August 2003, 06:32 AM   #7
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Bas,
ESL panels are capacitive load and this couses peaking in the freq response,which on all ESL`s is being controlled with a serias resistor to the primery coil.
Do you have an idea for the tuning resistor position in your case?

It`s a fine expriment,let us know if there`s a solution for that problem.

BenY.
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