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Old 2nd September 2013, 10:42 PM   #1
h2mster is offline h2mster  Germany
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Location: Eppingen
Default add another output transformer

hi lads,

i ordered an ubt-1 by one electron for an valve amp. by the 2 EL34 design the 8 watts are a little low to drive the 50 watt speaker (weber dt-15)to it's qualities.

is it recommended to enhance the output stage to 2*2 E34 and than run 2 ubt-1's in parallel to sum em up? I orderes 2 matched pairs of the EH EL34. I am scared of leveling out frequencies this way..

or is it better to do a 3-EL34 output design and level the plate voltage up to 400 volts? to get ~15-18 watts..

yours
andy
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Old 3rd September 2013, 12:55 AM   #2
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Join Date: Apr 2010
Quote:
Originally Posted by h2mster View Post
hi lads,

i ordered an ubt-1 by one electron for an valve amp. by the 2 EL34 design the 8 watts are a little low to drive the 50 watt speaker (weber dt-15)to it's qualities.
So why are you running the tubes in triode?

Quote:
is it recommended to enhance the output stage to 2*2 E34 and than run 2 ubt-1's in parallel to sum em up?
I guess you could, expensive way of getting 16W though.

Quote:
I orderes 2 matched pairs of the EH EL34. I am scared of leveling out frequencies this way..
Something lost in the translation.

Quote:
or is it better to do a 3-EL34 output design and level the plate voltage up to 400 volts? to get ~15-18 watts..

yours
andy
I am assuming (and I could be wrong, been many times before) that you are using this design,

http://www.one-electron.com/amps.html
http://www.one-electron.com/Randall/Randl_p1.pdf

using this.

http://www.one-electron.com/Trans/UBT1_20.pdf

Not quite your average guitar amp. Although if you used the 6SJ7 and the EL34's in pentode, unleashed the 6SN7's, might be killer.

Might want to look here.

http://www.valvewizard.co.uk/se.html

Last edited by Printer2; 3rd September 2013 at 12:58 AM.
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Old 6th September 2013, 10:44 PM   #3
h2mster is offline h2mster  Germany
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mm I'd like to stay on the triode design to stay with classA for the harmonics. so i guess another output trans had to be bought.

but thx for the helpful answer Printer2
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Old 7th September 2013, 12:49 AM   #4
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I like Class A amps. I have a little Champ amp on beside me right now. Pentodes work in Class A also, more harmonically rich than triodes though.
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Old 7th September 2013, 08:31 PM   #5
h2mster is offline h2mster  Germany
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Join Date: Mar 2013
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Default thx printer2

k i'll review the calculations again.
thx a lot,still come back with more later
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Old 13th September 2013, 08:23 PM   #6
h2mster is offline h2mster  Germany
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Join Date: Mar 2013
Location: Eppingen
ordered the BFT-1B and another UBT-1 let's see

reviewed the randall schematics after that i think of using 2 rectifying tubes, too.. but i wonder if this makes much sense in a single ended guitar amp..
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