Express Combo 1 x 12

Hi Folks,

Happy New Year , I finished my AA wreck build a few months back, It turned out great, played around with it and have got it where I like it .

I ended up putting the grid resistors directly on the sockets and not on the board ,

I played around with output tubes, tried 6V6's , KT66's and ended up with EL34's ,

Also added the Fischer PPIMV #3 that phase cancels the signal from the grids to of the EL34's , it works OK to a point , from full to about 1/2 is useable , after that it just loses its mojo. I actually keep it on full now .

I squeezed it into a combo cabinet slightly bigger than a 5E3 cab, it's so compact that people don't realise the beast inside 😂 and played around with speakers, I ended up with the Eminence Wizard which is great with the circuit , it's a very efficient (103db) 75w take on the Celestion G12H30 , it can handle the EL34's with ease.

I did have some issues with the biasing , I tried everything from 50 to 70% plate dissipation , there was serious harsh grainy squawks on certain notes when biased too cold ,I discovered the circuit is best suited to 70% plate dissipation , that's the Wreck spot , anything lower just doesn't seem to cut it .

After a few months of testing and playing in gigging situations , I think I'm pretty happy with the results.

I used a combination of Jupiter and Sozo coupling caps, basically what I had in my stash , they're still burning in so it'll only get better with age ....

It's a little compact combo , a wolf in sheeps clothing .... very happy with the results ... next up a Rocket and a Liverpool

here's some pictures

regards

Mark