[Amps] Restoring DX100

[John Lyles]

900 volts on pair of 6146, 6146A, 6146B is exceeding max ratings for the 
tube. Not only is there overdissipation risk but also arc over. The 
socket for the rectifier tube will also be close to breaking down. Mine 
was definitely arced there, and I eventually solid-stated the HV 
entirely. eliminating those tube sockets from the failure chain.  This 
did provide nearly 800 volts before key down. It dropped with carrier. 
I don't remember whether the 1625s liked it, as they were quite rosy. I 
replaced them with 6CA7/EL34s with a screen regulator.

125 - 130 watts output was typical in mine. Its pushing the tubes a bit, 
but that's a personal thing.

The two series electrolytics and their bleeder are weaknesses in the 
DX100, esp. given the vintage. Recommended to replace them up front and 
don't take the risk of leakage in one causing the other to be 
overvoltaged. Check the mid point voltage to make sure that this doesn't 
happen, esp since the bleeder is tapped there to provide screen voltage 
I believe (memory doesn't always serve me).

73
John
K5PRO