Old Valve Radio to Amp Conversion question

[willow13]

merry christmas tim

[tubeswell]

You can do something with the EF89 and the 6AV6 in the pre-amp, and the EL84 as the output tube, and the EZ20 as a rectifier (although you might want to go to an EZ81 rectifier)

The PT (if it is in working order) will have enough juice for those. I'm guessing the OT will be suited to the EL84. You might even be able to salvage one of the pots for a vol control. I'd probably go with new resistors and caps though, and probably new tube sockets, and a new speaker.

[timj47]

Thanks so much,

[tubeswell]

So I'd look at single-ended output stage designs like the Vox AC4, which has a typology that could be adapted to those tubes.

http://www.blueguitar.org/new/schem/vox/ac_4.jpg

I'd start by getting a layout diagram together (about how you will connect the dots on schematic).

At the same time you can take some hi-res pics of the amps guts showing the PT - and noting where it is connected to the on/off switch and the mains fuse etc and where it is connected to the heater pins and the high-tension supply, and label these wires. Do a similar thing for the OT (which wires are connected to the speaker, and which wire is connected to the EL84 tube socket, and which wire is connected to the DC supply). Along the way you will begin to learn about transformers and what they do, and how they work.

[timj47]

looks like the transformer (the biggest one) is cooked, it has leaked nasty looking goo