wb wrote:
>
> Maj6th wrote:
> > I need tube advice, what tubes can replace a 6L6 without being biased
in a
> > guitar amplifier, and what is the sound difference?. Is there a good
source
> > to find out this information?
> >
> > Maj6th
> >
> >
> Hi,
> The closest relative to the 6L6 is the KT66. It can be swapped in but
> it's filament draws more current. Most amps will probably have no issue
> with this, but it would be good to find out if your power transformer
> can handle at least an extra .6 amp on it's 6.3 volt winding.
> The EL34 will work as long as pins 1 and 8 are connected together on the
> tube sockets. But again, the EL34 draws a LOT more filament current then
> a 6L6. You can NOT substitute the 6V6. It is incapable of handling the
> plate voltages of the 6L6 and also requires almost double the plate
> impedance for it's output transformer.
> Original KT66's from Europe have a slightly mellower sound then the
> 6L6. But old black and even gray plate RCA 6L6's also have a softer,
> more laid back tone then todays modern production 6L6's or the classic
> GE and Sylvania 6L6's of the 60's.
> Personally, I would suggest trying the different 6L6's out there
> today. Try Svetlana, Sovtek, and JJ 6L6's. They all sound different.
> NOS vintage 6L6's are out there, but they are very expensive.
> Modern KT66's would also be worth a try. Believe it or not, the Valve
> Art KT66 has a very classic warm tone. I believe that one is actually
> made in China. What type of amp do you have?
> Bill
Don't forget the 5881.
It is made now in Russia and is basically the same as 6L6GC.
Always check the bias when replacing tubes.
Anode dc current x Vdc from anode to cathode at idle should be less than
15 watts in guitar amps
with fixed bias.
Patrick Turner.
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