New 2-6V6 non-HRM ODS w/ built-in 'lator

[mlp-mx6]

Here is my Here is my latest "baby". I have a couple others in the works...

I did a couple things kinda fun in this one.

I used the 12V relay supply to power V1 & V2. I used the 1.3A Radio Shack 12.6V xfmr w/ a bridge recto and a 7812 regulator, which can theoretically supply 1A. I initially had all 4 preamp tubes DC-powered, but the voltage dropped below 12 once I had 3 tubes in, so I had to rework that.

I also put LEDs for the footswitchable functions on the amp face, and made it so that when the either the panel switch or footswitch turns on the LED it turns it on for the amp face as well. (the amp face switch does NOT turn on the corresponding footswitch LED, however)

I used a triple-relay board I got from deric on this board - Thanks, Deric!

The relay/footswitchable functions are OD, PAB, and Mid Boost.

This was fun as an exercise. I already had the Deluxe Reverb power xfmr. I bought the chassis from another forumite more than a year ago, then finally decided to get after it and complete the project.

Gotta order the faceplate next.

Already she wants to sing - very eager to feed back. Now for the tweaking!l

[mlp-mx6]

A few more shots.

There are a LOT of wires running along the front. I may try to re-route things so they're a little tidier. The amp is all but dead quiet, though.

[David Root]

Very nice. I see you are using can caps. No hum problems either, that's good. Tell us about the ODS circuit.

[mlp-mx6]

Thanks, David.

Yep, the can caps are working fine. I ran a separate ground lead for each can. Other than that, nothing special to accommodate them at all. I chose them primarily for space considerations.

It is primarily a non-HRM 101 circuit. Skyline EQ. Deep switch, no Rock/Jazz switch. Because it was what I had as I was stuffing the board, I used primarily Xicon MPP caps. The PI caps are 715s - again, what I had on hand. I may swap these for 6PS caps now that I have some in-hand. I want the amp to "play in" a bit before I start tweaking much.

I used a larger 2.2uF presence cap as an experiment. We'll see if I keep it.

The 6V6s have the typical 6V6 tone, so I expect to want to tweak the OD a bit to suit that output voice. I'm running NOS GE 6V6s at this point. I'd prefer to voice the amp for current-manufacture tubes, so I'll likely get some JJs, since the voltage is around 470 on the plates. (Deluxe Reverb PT from Mojo that I bought probably 10 years ago, no tube recto.) The next one I'll complete will be a 100W 6L6 amp, so that will be quite the opposite end of the spectrum. At this point the 6V amp will "cut" quite well - but lacks the "girth" of a larger amp.

Like I mentioned, aesthetically I'd like to clean up the wires along pot wall, but functionally it is fine - the amp is very quiet.

The OT is from Triode Electronics. It is a Magnetic Components product with 4/8/16 output taps. So far I'm pleased with the unit, but that isn't saying much since "so far" is only a couple short evenings.

If anyone has suggested voicing mods for a 6V6 ODS (as opposed to 6L6 or EL34) I would be most appreciative.

[angelodp]

Is that the Tweed Bassman OT.

[mlp-mx6]

No, it is the Deluxe Reverb 4/8/16 OT.

http://www.triodeelectronics.com/tf65wscta48opaper.html

[angelodp]

What network did you run for the mid-boost .002 / 390?

thanks

[mlp-mx6]

Yep, that's it. I did not have a .002 handy so I paralleled 2 .001 caps instead.

[angelodp]

Cannot tell for sure but did you not go with the LNFB? What slope and
V1a plate resistor are you using.

[mlp-mx6]

No LNFB. 220/150 220/150 in this specimen. I like it so far.