my 250 watt amp can be a 500 watt amp for less than 2 bucks plus tubes

[Guest " "]

finally got a hold of the schematics for the Manley studio 250 watt amp and the 500 watt amp. The 250 watt version uses 10 6l6 tubes and the 500 watt version uses 10 kt-90 tubes. in looking at the amps, and the schematics, they are identical. same power tranny, same output tranny, same circut board, same componet values. except

[Guest " "]

everything in the amp is the same except for the tubes and the bias circut. here is the 250 watt version bias circut.

[Guest " "]

Here is the 500 watt model bias circut

[Guest " "]

so basically, add about 4K in resistors, replace the 10 6l6's with 10 kt-90's, and you go from 250 to 500 watts. all other parts are exactly the same.

the model 250 is listed at 7k a pair, and the 500 at 9k a pair.

[SilverSport]

nice...are you going to upgrade???

Bill

[Guest " "]

going to make the changes his weekend. thinking about some kind of switch so I can switch back and fourth.

[Colin]

with what? Cornwalls? Might not sound better...