Tube Radio Guitar Amp: Part 4 Pacemaker tagboard layout

There are few interesting videos of tube radio guitar amps conversions on the web.  All of them however, are single-ended amplifiers, i.e. using only one power tube (like the Fender Champ).  As far as real conversions go, this is about the only video that’s relevant:

Just using the phono input to plug in your guitar is easy, here’s an instructional video if you need that:

The silly dilemma in the second video sums up the reason why there is so little information on the web about conversions:

  • If you want, you can play guitar on any tube radio with a phone input, you just need a connector cord.
  • To make an optimum guitar amp out of the tube radio components, you will have to completely rebuild it, so you can win some of the power the previously went to the RF section tubes for your amp. If the radio was a stereo unit, you want to use the power available for a mono channel.

So it’s either use as is or rebuild completely, there is no middle road or easy guide. In fact, when cheap generic strattera online no rx buying a tube radio set, keep the following pointer in mind:

  • the more tubes, the better
  • more channels is better (stereo is twice the power)
  • the bigger the power transformer, the better
  • look for radios with ECC83 (preamp) EL84 (power) and EZ81 (rectifier)
  • avoid radios from the 40’s
  • bigger speakers is better, better change that the output transformer(s) can be used

On the other hand, I have not seen a tube radio that does not contain all elements of a 5W Champ head: often tubes, sockets, chassis, mains transformer, terminal strips and components can be salvaged.  This leaves you only with the cost of a very good output transformer for 5W single ended amp (40 euro max), some jacks, a pilot light and pots, just to build your own 5W monster (with vintage power transformer :-p)

So, there was work at the drawing board…

IMG_5119

And the vibrato section:

IMG_5120

Looking for the right components:

IMG_5121

The bloodsucker from the amp parts store charge 25 euros for a Tweed Deluxe tagboard, which is just a stupid piece of cardboard.  In the GAMMA store I found this riveting set for 11 euros.  The rings are a bit larger than normal tagboards, but work just fine.

IMG_5124

Laying out the board:

IMG_5128

Tremelo board and main circuit board wired up:
IMG_5130

Leave a Reply

Your email address will not be published. Required fields are marked *