Over The Air > Amplifiers

Johnson Viking Thunderbolt

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k9yli:
I think, if i remember from when i looked at a  year or so ago it is just a  6.3 volt filiment transformer wired backward off the  6.3 volt  filament line.

120 ac out.   simple rectifier/ cap  circuit.
very little current drawn..
no real load on the  filament  transformer.

i havent finished yet but the heath has plenty of room to mount  two   dow key  relays i accuired,  under the chasis...

bias supply is also mounted under the chassis..

for the relay power  i have a 12 volt  1 amp   wall wart  to wire in..

only modification to the heath is  replacing the two   rg8 cables under the chasis to the   SO239s with new cable running to the relays.

nothing external or  holes in the cabinet.

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