The pic shows an Eminence "The Governor" speaker that the previous owner installed. The speakers are often changed in these amps to make them sound "ok" on the dirt channel. The dirt channel sounds like crap no matter what you do, so changing the speaker makes no sense in my opinion. Just use the thing on clean and use an "external master volume" in the FX loop so you can drive the preamp to get some proper crunch.
I have since reinstalled the factory speaker (luckily the speaker came as part of the amp deal).
Repairs:
- Ripped tolex fixed
- Cleaned. And cleaned, and cleaned. It was filthy.
- Tubes changed. 12AY7 installed in V1 position. Rebiased.
- Standard overheating low-voltage dropper resistors and Zener diodes replaced and custom heatsink fabricated. Burned circuit traces repaired.
- Other known weak resistors replaced
- Every electrolytic cap replaced. Main filter cap increased from 50uF to 100uF to tighten up the known slightly loose bass in these amps.
- Electrolytic caps in the signal path replaced with Panasonic metallized polyester
- All jacks replaced - every one was broken or worn out
- Dirt channel master volume pot swapped for a logarithmic pot (comes with a linear pot standard)
- New rear panel fabricated (the factory ones always get damaged). The broken panel it came with is actually off a DeVille...
- Faraday shielding replaced