Fulltone Fulldrive 2 Debugging

[seten]

Just got this online, not sure if its non-mosfet or just before they started printing "mosfet" on the enclosure. Says its from 1998. thought I'd fixed it (loose connection and bad volume pot - anyone know where to get a 500kA pot with a push/pull switch?) but whenever the boost switch is enabled I lose all signal. Been at it for 5 hours now, literally tore the board apart (its gooped and it was the only way to get at it) and sewed it back together with hookup wire.

Cannot for the life of me figure it out because according to this schem (https://www.google.com/url?sa=i&source=images&cd=&ved=2ahUKEwiIsL-Yy5vnAhVBUK0KHcasDKsQjRx6BAgBEAQ&url=http%3A%2F%2Ffuzzypedals.blogspot.com%2F2015%2F06%2Ffulldrive-deadringer-mosfet-overdrive.html&psig=AOvVaw3DxG5CDoBoWWB3-xpvm0zh&ust=1579932993799713) theres only a few things changed when the boost switch is on vs off and I thought I'd thoroughly checked all them - maybe this is non-mosfet and so the schem isnt accurate but everything else has been congruent so far.

Current theory is that the IC is shot and its actually not working properly even with the boost switch off. Hope thats not the case since the top of the IC is in the heart of the goop. solder side is available to me though so here it is:

Boost on:

1- 1.9
2- 1.7
3- 3.8
4- 0
5- 2
6- 2.2
7- 2.2
8- 9.4

Boost off:

1- 4.6
2- 4.7
3- 4.6
4- 0
5- 4.6
6- 4.6
7- 4.6
8- 9.4

Even I can tell somethings not right here - is it the IC though or something else?

[PRR]

Short to ground, probably via diodes/FETs, at IC1 pin 2.

That's a horrid cluster-fork of switches and stray devices, and if glopped, finding fault may be not worth the pain.

Does the boost pot do anything? An open in here might also make these odd voltages.

The fact that voltages are right in the other mode strongly suggests the chip is OK. The bad readings at chip part 2 are exactly what we expect if chip part 1 has pulled down to 1.9V.

[seten]

Short to ground, probably via diodes/FETs, at IC1 pin 2.

That's a horrid cluster-fork of switches and stray devices, and if glopped, finding fault may be not worth the pain.

Does the boost pot do anything? An open in here might also make these odd voltages.

The fact that voltages are right in the other mode strongly suggests the chip is OK. The bad readings at chip part 2 are exactly what we expect if chip part 1 has pulled down to 1.9V.

found a solder bridge! it was so damn big i just assumed it had to be a component but nope. thanks for the help!