I added a coil cap and russian vacuum relay to my thunderbolt so I can operate 160 meters. Adding a switch wafer to the band switch, allowed me to switch on 160m by selecting the resistive input band position. Works great and front panel looks stock. Also I added external relays and 30 amp dc power supplies to drive the 4-400 to 7 volts during xmit to get full emission out of older tubes. The filaments are soft started - ramping up to 5 volts in a couple of seconds and 7 volts key down. The Hv is also switched on with transmit and the bleeders 250 w standby power is eliminatedn8fvj thanks to you also.. Fun stuff. W d y
n8fvj, I looked you up on qrz but did not find your email, as I wanted to contact you off line. I had one contact with an 500 owner in Arizona that wanted pickup only, and that is not possible to drive 4400 miles. Shipping is needed.My email is on qrz, so you can contact me, thanks Woody