LeGrace wrote:I can do a diode mod, except I wonder if its so great why has it not been incorporated into the standard design already? What's the catch? Or the thermistor mod? Even if I knew what this was the watch out for the HOT comment is alarming!?
Keep in mind, there's a diode mod, and there's a diode mod. The "yellow sheet" mod doesn't replace the tube rectifier - it simply adds a couple diodes in line with the transformer leads to prevent reverse flow that can kill a tube.
I can buy GZ37 or GZ33 tubes, the only examples of which I can find are NOS GZ37's at a cost of ~$150 USD each! By the time I get them into Canada with duty etc close to $500 for the pair. Sadly I cant afford this after what I've already invested. Was a stretch to start with.
I'd be hard pressed to afford them at that price as well. Lucky me, I got a couple nice old Canadian military surplus Mullards (circa mid '70's) for $80 each a couple years back. NOS! Arrrr !!! Probably the last two available at those prices. Timing can be everything.
The Webers are working fine. Except for how long, plus the amps seem to have lost some of their mojo vs the tube rectifiers.
Can't say as I cared for the tone of the WZ68 here, but it's good for a spare. Some problems apparently with longevity, but I'm thinking a lot of that may be due to the high VAC coming out of the average wall nowadays. I used mine driving a quad of KT120's kickin' it hard with prog rock at ridiculous volumes with nary a problem.