Guitar Tube Amp Restoration and Repair by Dr. Ron

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The DynaMite Head

The Dyno Amp continues the low-volume guitar amp theme. It has a 12AX7 preamp and phase invertor, 6X4 rectifier, and a pair of 6AQ5 power tubes, which should be about 4.5 watts. I like to turn it up to 10 to get that lush open tube sound, which is loud enough for a bedroom! The Dyno was originally a Dynovox amp, hence the name.

I've decided to remake the Dyno into a tweed amp (the Dyno Tweed), which involved designing and making my first eyelet board.

Here are some sound samples recorded with a Boss BR8 and a Samick Les Paul with DiMarzio Tone Zone and PAF Pro pickups. I start with the neck pickup in single-coil, switch to double-coil, and end with the bridge pickup. The guitar is connected directly to the amp without effects.

These are sounds with 6AK6 power tubes, which is about 2 watts.

These are sounds with 6AQ5 power tubes, which is about 5 watts.

I really like this amp because it sounds cool and is really fun to play on 10, which gets that awesome tone. With the 6AK6's you can do that without family members complaining.