Tube Amp Archive

CB Amp wrote: ↑Fri Aug 22, 2025 8:59 pm Thanks for the link Stephen. I draw the schematic, it's really easy.

It sounds like an interesting. I'd enjoy taking a look at the schematic, if you care to share it.

Thanks,

Stph

Some history about Kitty Hawk is recorded on the "Blue Book of Guitar Values" site: https://bluebookofguitarvalues.com/guitar-amplifiers/manufacturers/kitty-hawk I have no idea how accurate this history is. There are no source citations, so it is hard to validate the information. Also some info and ...

I spent a fair bit of time chasing a "problem" in an amp that eventually turned out to be a bad pickup in my guitar. It was one of those "doh!" moments.

If the tube is out of circuit, then the heater to cathode resistance should be close to infinite. In circuit, it depends on the context.

Is that one of the "All American Five" radios that come with a hot chassis that's only insulated by the plastic case? Be careful. Yep. That's why an isolation transformer and proper grounding would be requirements to make something like this work as a guitar amp. You don't want to convert one of th...

Also, If you look closely at the volume control on the schematic which has a tap, you'll find the input jack there. The one I have for repair behaves this way: With volume control fully almost fully CCW, it cuts out the radio & engages the input jack. On the front panel there is an indication that ...

Thanks. I guess I'm not crazy thinking this is worth, at most, a tenth of the asking price.

In light of this report, what is a good alternative to the WTCPT?

I've been looking at the WE-1010A, but now I wonder if that's the wrong answer.

Stph

Looking at that Reverb listing, I don't get the mystique. How can this amp be worth north of $11K?

It already has a Phono input, but I don’t know how one would have used that since most phonographs already had built in audio amps. In any case, leaving it as it is makes a lot more sense. Agreed. I've converted a few radios to amps over the years. It's always more complex than building something f...

The fact that the circuit is on a PCB will complicate things.

Attached are the schematic and parts list for the GE Model 861 table top radio. It looks like you could convert this into a little practice amp: add an isolation transformer add a three-wire cord, making sure to ground the chassis yank the interstage transformers, tuning cap and antenna wire up the ...

I used RG-174 for a long time. It's tender. Insulation melts very easily. I switched to RG-316 about 15 years ago. The PTFE insulation prevents soldering iron scars. Amen, PTFE sheilded is great. Doesn't melt. Ever! I've bought from https://apexjr.com/wire.html with good results. You can also find ...

A few notes are here:

https://www.vintage-radio.net/forum/sho ... hp?t=28068

Unfortunately, the circuit drawing is AWOL.

I keep a few things here: https://thermionic.info/

Stph