[notme]

On Thu, 15 Jul 2010 04:15:38 -0700 (PDT), Kruse
wrote:

On Jul 13, 12:01*pm, notme wrote:
hello all
would welcome advice on a scott 299c bought with 4 6l6 valves, andd i
would like to fit the intended 7591 valves, i have no manual for this
amplifier and i note JJ 7591 S *(with base) and 7591 7591A Electro
Harmonix (without base). can any of these valves do and is there any
difference? the amplifier to my ear has always sounded slightly
distorted to me and i hope by fitting the right valves may improve
things. i have just basic technical knowledge although i am a retired
wireman so handy with a weller

Are you positive that the output transformers are original?
Obviously, you need to get a manual that has the wiring diagram.
Also, check to make sure that the new tubes do not have a larger
diameter than the original tubes, as the 7591s sit real close to the
output transformers on a 299C with factory output transformers.

thanks for your response
as you have hi lighted, the closeness of the tube to the transformer.
thats another reason why i want to ghange back to 7591, the 6l6 valves
that ive got in currently are actually touching the transformer which
cannot be good for them with all the extra heat transferred,( i have a
leak amplifier with el35 valves and those are not nearly as fat as 6l6
for that matter if i plug in a el35 into the socket there is a gap of
4mm clearance). my real question again is, in that respect is the jj
7591 fatter than the electro harmonics 7591, is there a difference of
quality between them, does the closeness of the valves eventually
cause damage to the transformers? i note from the picture that the
latter has not appear to have a bakelight base as the former, and is
any of them as fat as the rca 6l6?
i feel certain i have the original output trannys as per factory, i
also can easily obtain a schematic from various sites, i do note i
modification (maybe to do with the fitted 6l6) 330k resistors soldered
to the wipers of the dc adjusters.