HRM/D-uator/Reverb all in one amp- new layout posted

[heisthl]

The reverb recovery plate shows 100K on the layout - 150K on the Schematic

[Bob-I]

Thx everyone. Lots of small things cleared up today.

Andy, I hear you. All these gain stages can turn to mud if you're not careful, so what's another RC in the scope of all of these components.

heisthl, oops, thanks for catching the B+ voltage, I had the node connected on the wrong side of the SB switch. Also, I'm not sure at this time what the plate load on the reverb return should be. I have 100k on my 3 channel amp, but the reverb on the Glaswerks I heard has far better reverb so I'm thinking 150k like he shows on his web site.

Gary and Mr. dB, yes, I guess I didn't translate my chicken stratch drawn schem well to Visio, but I got it on the layout. The coupling caps was drawn as a 1.5K resistor

So how do people feel about this being 4-6V6's instead of 2 6L6's (same load right?). The PT is 200ma 300-0-300.

[bloom]

Hi

this is very nice, I've been looking for this for a long time. I have few questions, excuse my innocent nature. I am not used to reverb (or say, effects) in parallel/series. I see that the reverb is in serie, and allows to mix the clean to the reverbed sound, by having a "bypass" from IN to OUT of the reverb, and a 150K resistor on this bypass, then you mix the two (clean and reverbed) with a pots. My questions are:
- What is your value for the mixing potentiometer? It's not showing up onthe schematic.
- Why using 150K resistor in the bypass section. I mean, how to you come up with this value. Why not 220K, or 3.3M?.. Also on some other schematic, there would be a cap in parallel with that resistor, very small value, like 20pf or so. Why don't you have one in your schematic? Is it not necessary?

Thanks a lot for the explanations!

[Bob-I]

Wow, it's been 3 years` since I built this amp. I'll try to remember.

Hi

this is very nice, I've been looking for this for a long time. I have few questions, excuse my innocent nature. I am not used to reverb (or say, effects) in parallel/series. I see that the reverb is in serie, and allows to mix the clean to the reverbed sound, by having a "bypass" from IN to OUT of the reverb, and a 150K resistor on this bypass, then you mix the two (clean and reverbed) with a pots. My questions are:

No, the reverb is in parallel with the dry signal that passes through the 150K bypass resistor.

- What is your value for the mixing potentiometer? It's not showing up onthe schematic.

I think it's 100k.

- Why using 150K resistor in the bypass section. I mean, how to you come up with this value. Why not 220K, or 3.3M?.. Also on some other schematic, there would be a cap in parallel with that resistor, very small value, like 20pf or so. Why don't you have one in your schematic? Is it not necessary?

Fender used a 2.2M or 3.3M on the 60's reverb ckt, way too much reverb IMHO. I's unusable above about #2 on the dial, plus the big resistor robs so much gain they used an addition gain stage to recover the lost gain and the small cap to add some highs that were lost in the big resistor.

The 150k is a good value for enough reverb. Too low of a value and it becomes a feedback loop, too high and gain and highs are lost. I tried from 100k (too much feeback) and 220k (too much reverb).

Thanks a lot for the explanations!

No problem.