Magnatone M10 reverb driver deviation from schematic

[Carlsoti]

   Hello all. I've got a Magnatone M10 on my bench that came to me DOA. It was modified before I saw it. There's a PI inject jack installed on the side of the cabinet, and a hass-alfed 3-prong IEC was put in the cabinet, but no ground was installed, which I've corrected. I've rebuilt the power supply and replaced all the electrolytics I could find, including the crossover cap on the "tweeter." One that seems to be missing, compared to the schematic, is on (or not on, in actuality)the reverb driver tube.

   I get sound from both channels now. The 'verb doesn't really do much but I can tell it's hiding in there, and verb/trem channel is noticeably quieter than the other. Additionally, the higher the verb settings, the less trem I get. ...

   I just now realized I forgot to check the tank. Does anyone know what the DCR of the reverb ins and outs should be for this amp?

The question I was getting at is in regards to the reverb driver. This is wired considerably different than the schematic. Attached are some pics of the schem, my poorly drawn version of the driver tube wiring, and a copy of the voltages I measured after getting the caps changed.

Is this a viable reverb driver circuit? Should I convert this back to what the schematic shows? What's the likelihood that the recovery transistor is hosed?

[Keppy]

What's the likelihood that the recovery transistor is hosed?

Don't know, but transistors are easy to check. If you post the whole schematic someone can probably tell you what DC voltages to expect on the three pins.

Is this a viable reverb driver circuit? Should I convert this back to what the schematic shows?

That probably depends on whether the tank is original. I would think that if the tank is original and functional, and the current scheme isn't doing it for you, then reverting to factory would be the next move after verifying the recovery circuit.

[Carlsoti]

Thanks, Keppy. It appears as if the "C" Gibbs tank, if not original, is an appropriate tank for this model. DCR is 181.3ohm for the input and 176.6 for the output. My iron is on and I'm eyeing that transistor next. I just can't see how this tube is pushing this tank with how it's wired right now.  Attached is the schematic I'm working from.

[sluckey]

Wire it like the schematic if you want to fix it properly. After finding that mess on the reverb driver I'd want to verify everything in the amp is wired correctly.

[Keppy]

What Sluckey said.

If I'm looking at that schematic right, then the reverb is mixed with the dry signal BEFORE the recovery transistor, and the dry signal comes from the reverb driver tube. That means all of your symptoms could be explained by a bad reverb driver scheme. Here's hoping things work out that tidily.

[Carlsoti]

The recovery transistor is good, though leaky as expected, according to my DCA55 Peak tester. I've ordered the appropriate resistors to reconfigure the reverb driver. I haven't gone through and checked every single component, but I have traced the signal path through the amp. I had to get that far just to determine what tube was doing what job. I was hoping the driver tube was wired in some fashion that actually made sense by someone that knew what they were doing, but I just couldn't see it.

[Carlsoti]

That did it! I didn't yet get a good video of the reverb working, but it does it's thing and the trem now warbles as it should. I still need to disconnect the "tweeter", but other than that, I'm calling this one done. Thanks guys. Quick and dirty video at the FB link.

https://www.facebook.com/100074733483188/videos/497997101732060