My Handbuilt 6550 / KT88 Dual Rectified Amplifier - Demo both clean and pushed into Sag
Guitar

My Handbuilt 6550 / KT88 Dual Rectified Amplifier - Demo both clean and pushed into Sag


For fans of vintage tube goodness here is a demo of my custom built 6550 tube amp.  I've owned this for quite a few years and it was hand-built by any amazing musician tech who sadly was losing his sight and had to get rid of most of his gear.  

The amp uses a rare vintage circuit that is similar to the lat 1950's Tweed Twin with a pair of rectifier tubes.  here is the lineup:

(3) 12AX7 (or any similar 12 volt preamp tube)
(2) 6550 / KT88 tubes (or you can straight swap 6L6GT's or even 6V6's)
(1) 5U4 Rectifier tube
(1) 5Y3 rectifier tube

The amp controls include the following:
- Preamp gain
- Bass and Treble tone controls (on a concentric pot)
- Volume
- Midrange tone control
- Presence control

It also has a traditional "hum" control pot but it never seems to hum much to me so I leave it alone.

There are two 1/4" output jacks -0 one for 8 ohms and one for 16 ohms.

It has a single 1/4 input on the front of the amp and a green indicator light.

The sound can be incredibly clean depending on what preamp tubes especially the one in the first position.  But when you turn up the preamp gain the rectifiers are pushed into amazing sag that can be saturated enough to be similar to a vintage germanium fuzz circuit but mostly just sounds like sweet output tube drive.

Check it out:



 





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