6L6 and 807 in place of KT88?

Friend

I may have the answer for you! The following product is for sale now on Audiogon! I have the Don Allen Preamplifier and I can tell you that it is just gorgeous sonically! You are interested in taking a step up in presentation. This would do it!


Don Allen 807 Cake Pan Amp single ended tube amplifier
Asking $625.00 obo
New Retail $850.00
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Studio is on point. The particular tube characteristics were used in designing the amp circuit. If it was not designed to accept other power tube families you risk damaging the amp, destroying tubes and/or having crappy sound with substitutes.

Perhaps a 'goner with a better grasp of tube topology can describe the reasons.

Friend

You are taking a chance with that type of replacement. The KT88 has different bias points as well as different filament requirements. See links below to compare:

http://tdsl.duncanamps.com/show.php?des=KT88

http://tdsl.duncanamps.com/show.php?des=6L6

Also, when a tube is not biased properly - it is not happy. Therefore, it most likely will not be imporessive as it is not being utilized properly. One last thought - different tubes work best with certain input and driver tubes.