volume problem

[Jazz-O-Sonor]

Hi,

I have volume problem on my amp
it is very load at 2 and starts to break up at 3
The amp is loud at 2 of volume and sounds
fantastic but when the knob is on 3 it gets even
louder (very perfect volume for a bigger jazz gig with
load drummer ) but loses the clean character and
when playing power chords or using a pick with harder
dynamics the amp gives distortion.
This is a problem for me since I need only cleans for
jazz , i wish the amp could stay clean at 3 or better 4
of volume .
Do you think that the pull-boost could be involved
in this even if not pulled ?
or could be that the sovtek 6L6WXT cannot reach the
application ?

Amp description:
- Deluxe pull boost circuit ,
- Pro/super Reverb PT ,
- Mercury Super Six Reverb OT w/ 2&4 secondary
taps(100v)(the 2ohm tap is hooked up),
- 2x matched Sovtek 6L6WXT,
- WS1 Cooper Cap rectifier,
- original TR fiter cap board w/ 2x 220uF-350w in series
and 3x 20uF-500v in parallel filter cap arrangiament ,
- 2x10 100v 8ohm Eminence Delta Demon speakers wired in parallel.
-All the PI resistors have been changed to TR values
-all the electrolytic and filter caps are brand new
-the amp is quite not noisy except for the reverb that
gives a little noise only when the rev knob is tuned up.
- also tryed other combination on first stage filter
caps values but got always the same result on the volume problem.

thank you, John

[JoeM]

Hi John,

Looks like you already have the amp setup for decent headroom. Not sure why you have the speakers connected to the 2ohm tap. Probably not much difference, but I'd try the 4 ohm. Looking at the specs for the Delta Demons, there are other speakers that at least according to ratings are more efficient. Not much of a practical solution at this point, but 2 12s would give more headroom, especially a speaker like a Swamp Thang.

I too play jazz, and it can be difficult maintaining a pristine clean at high volumes. One of my favorite players uses a 300watt amp. Ive had good luck with Twin Reverbs, but it's not an amp I will cart around anymore at my age!

[txstrat]

If the amp already has a 2 ohms tap, I'd add two more speakers. That'd be most efficient for more headroom on same volume settings IMHO.

[Jazz-O-Sonor]

Hi,
thanks to you all for answering

my OT is a Twin/Super Six reverb Output Transformer
that is designed for 4x 6L6 power tubes ;
The amp is "Pro Reverb style" w/only two 6L6 ;
so using just two power tubes doubles the 2ohm *OT's impedance to 4ohm;
on the other side I have two '10 speakers (100w) 8ohm each wired in parallel for a 4ohm load;
*this should be a right match between the output & speakers impedance.
I tryed some 12AT7 in V1, V2 and in V3 without result ;
even with those quiter pre-amp tubes the volume
problem persists.

Thank you , John