Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => PC Express and JSchem - Schematics and Layout diagrams => Topic started by: tubenit on April 11, 2012, 07:13:11 am
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I was thinking about how much I like the clean tone of the Tweed BluezMeister, but that it would be cool to have reverb and vibrato like on a Deluxe reverb. So this is what I came up with. Haven't built it, but I'd love to.
CHECK for errors!! Any discrepency, go with the schematic which should be correct.
IF you don't want to use a phase invertor plate 10k trim pot, then I'd suggest using a 120k & 110k resistor for the plates.
With respect, Tubenit
* Edit added Dumbly DR which does not have an active FX. However, be sure to check for discrepencies between schematic and layout. IF there is a difference, go with the schematic drawing.
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At the risk of being dumb, which Deluxe reverb circuit did you decide to follow
Technically, none of them. I am simply adding a reverb circuit and a vibrato circuit like Deluxe Reverb AB763 has. And even the reverb & vibrato are not the same. I also used a tube rectifier unlike a D-style amp but similar to a DR. And it uses a fixed bias 6V6 power amp like a DR.
With respect, Tubenit
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hi
just learning ,,
6v6
does pin 8 ground need a resistor and cap
like 25uf 25v ,,,, 250 ohm ,10 watts
tom
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6v6
does pin 8 ground need a resistor and cap
like 25uf 25v ,,,, 250 ohm ,10 watts
This amp is fixed biased instead of cathode biased. So no, it doesn't need a cathode resistor and cap. You could build a cathode version if you wanted but the vibrato circuit would need to be modified.
With respect, Tubenit
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thanks for the answer..
now back to more reading and studying .... ..
and getting ready for this amp later next month ....and i bought some 12AT7 s this morning
tom
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Check v2 for validity. I noticed this valve had two triodes in parallel. Care to discuss this approach?
The approach is the standard that Fender uses on all their Fender reverb circuits .
Check out a schematic Princeton Reverb, Deluxe Reverb, Super Reverb, Twin Reverb ................ etc.......
With respect, Tubenit
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hi
well i have been looking and wondering about V4.
should ...........
16 ,,,,,,,,,,1M to ground line .
15 ,,,,,,,,,,,wire to bottom 16
1M
pin 3 V1 4.7 M resistor to ground
heres a pic
thanks
tom
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I don't understand what all your questions are?
Go with the schematic if there is an error between schematic and layout.
There should be a 4.7M resistor to ground from the .002 to mid-boost switch on the layout.
Remember, this is a DRAFT idea. As far as I know, no one has built this.
With respect, Tubenit
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This is closer to a Deluxe Reverb then Dumblish. I like cathode biased amps because I can simply substiture a 6V6, 6L6, or 5881 with NO changes.
The idea was to dumblize the DR tone stack. On my Tweed BluezMeister on clean using the midboost and PAB, it is almost the same overdrive/gain as with the OD channel engaged. Not as much but headed there.
So this idea would allow a DR with reverb and vibrato, cathode biased and a D-style tone stack. Note some other values and coupling caps are changed to make this more D-style friendly tonally.
CHECK for errors! IF there is a discrepancy, go with the schematic. This is a DRAFT idea, I have not built it. IF you build it, you might consider using a 300R/10w resistor and a 100uf cap for the power tubes.