plotting out deluxe rvb with some dumble bits

[imo1]

The heaters around the recovery lead are pretty far from the tube, and I made that even more extreme. The driver tube is a little closer because of the tag strips around the tubes.

I went ahead and redid the RG174. I never feel that good about that cable. I have some similar, but more stout cable that was recommended and I feel much better about using it in the amp. I am trying to do my best to make it road worthy. I will be flying it down to Texas on Monday(well packed) but it has to survive the trip.

I also replaced the 4.7nF with a 3.3nF and put a .0022 cap on the 220k in the reverb.

My relays are set to bypass through the amp "as is" so short of them falling out, that shouldnt be a failure issue.

I'm gonna play through it some more tomorrow and see if there is anything else I want to do to it. Otherwise I will pack it up on Saturday and she goes out into the field!

[martin manning]

Taking what is really a prototype amp on the road is a bold move. No shade, but I hope you have a plan B if something goes wrong. Good luck, and I'm sure people here will be interested to hear how it goes!

[imo1]

Touring is always like that. On the kickoff tour for my new band, i showed up with my touring amp and as we were leaving, the other guitarist, who had rented the van said "that amp is too big, it won't fit..you can borrow one of mine." He had an extra Fender Blues Deville. We left for the tour, and two days later, on the first show, the amp shut down three songs in in front of a sold out crowd. Thankfully we were out with Samantha Fish and she was carrying a back up amp. I was able to use her's for the rest of the tour. On my tours I always travel with a back up. On these, with three guitar players, it's a little more complicated

[imo1]

Mid tour report. Very happy with the amp!
Playing with two other guitarists. One is using a vibrolux and the other a blues deville, so I am the quietest on stage.

I love that I can get the amp to the exact sweet spot and am never too loud coming off the stage. The PAB in this circuit almost makes it like a tweed circuit in terms of feel. The OD, put in line with the clean circuit is powerful and has a nice low end. I’m running the OD master pretty close to full to step up just a tad over clean. OD with PAB seems to do that Dumble thing that people love where the notes have dimension within them.

I’m strongly considering doing this to one of my other fenders. I like the idea of scaling it up with different wattages. It sure is making me happy!

[martin manning]

Thanks very much for the update, and good to hear it's going well! I missed the clip you posted above, probably starting a new page hid it from me. It’s sounding very nice indeed, and I guess you got the hum problem solved? Sill interested in capturing the schematic when you get time. I will gladly redraw the one I posted above to match what you ended up with.

[imo1]

I pretty much used your schematic for pre. I’m traveling now, but just put a 1MA pot on end of drive circuit. Using the 220k/220k mixer resistor. All the same trem and PI-output tubes as deluxe reverb. I posted the schematic of the power section as well. I did put a .001 cap on the 220k in the reverb section.

I haven’t been able to A/B the OT with a more standard OT. The one I used has a bigger core, and I believe this is also contributing to the amps much better than deluxe reverb low end

[martin manning]

Ok, so your power supply is as shown here: https://ampgarage.com/forum/viewtopic.p ... 66#p478266
Using MM FBFDR-PM power transformer, and the bias supply input resistor is 100 ohm. Voltage is 400V at the OT CT.

Which output transformer did you go with?

Below I added the OD volume at the HRM treble wiper, a dwell control on the reverb driver, and a 1n (0.001u) across the 220k going to ground in the dry bypass. Not sure what you are referring to when you mention 4u7 going to 3u3 in the reverb. Please refer to this schematic and component numbers for corrections. Thanks!

[imo1]

The 3n3 is the one coming out of the 2nd stage of the reverb recovery.
I used the MM fat stack OT. FBFDR-O-FS

I’ll look at what you have once I have access to a computer

[martin manning]

The 3n3 is the one coming out of the 2nd stage of the reverb recovery.
I used the MM fat stack OT. FBFDR-O-FS

I’ll look at what you have once I have access to a computer

Ok, great. Maybe we can go section by section? Clean, OD, Reverb driver, Reverb recovery

Are your tremolo, PI, and Power amp straight-up Fender DR, as in the Fender DR schematic below?

First update: I added choke DC resistance and a 10k to drop the voltages down. Can you confirm your PI node voltage is ~330V With standard 120V line?

[imo1]

Yes, I have the same as the DR schematic in tremolo and PI circuit, as well as power amp section. I changed some of the ground spots, but its all the same.
I don't have a good way to check this stuff on the road and don't have the exact voltages on hand. I do remember that the PI voltages were slightly lower than the schematic, but within 10% and that the first two pre-amp stages were right at, or slightly higher than schematic

[martin manning]

No worries. The Fender voltages are not necessarily correct or optimum anyway. I updated the schematic to show the power rail a bit better, moved the reverb driver Trans to the screen node, and changed the dropping resistors to all 10k per your power supply schematic. When you get time have a look and see if I have it right, especially which tubes are powered by which supply nodes.

[imo1]

This was a couple of pages back-
I have V2 coming off off P4, and V1 coming off of P5

my voltages in order.
I was expecting a little higher output from the PT, but with the Weber “cap” rectifier I’m getting 400 at OT. Used a 1.5k for P3, then 15k and 2.2– getting 385 at P3, 295 at P4, and 285 at P5

[martin manning]

ok, got it. How about V4 reverb recovery? P4 or P5?

[imo1]

Pretty sure that comes off of the last node, P5

[martin manning]

Could probably go either way. I fixed up those items and reposted the scheme, and included a few more notes. The PI node voltage (P3) is now 387, very close to what you have. The last two are a 5-6% high, but in the simulator all triodes are identical and nominal, so the differences are within expected variation.