multiple preamps

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idiotequed  
Hey get your own solder
Posts: 220
(3/5/04 2:42 am)
 multiple preamps
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 for the sake of discussion, let's say that I wanted to put two preamps in a rack and then have the ability to send the signal to a mixing board in a studio or a power amp. let's say i wanted to take a preamp from a marshall jcm 800 and a marshall jtm 45. now for studio work i'm sure that a line level out would be needed; what if i wanted to send the signal to a separate power amp?

where would you stop building the preamp? after the phase inverter? before? what would you have to do so that you could have a huge amount of preamps in a rack to one power amp? i'm guessing some sort of output transformer? i'm rather interested in this not so much to build, but for information's sake.


 
Tiny Daddy
I will work on all amps
Posts: 525
(3/5/04 8:44 am)
 Re: multiple preamps
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 I would start with a nice power amp with dual rectifiers, phase inverter and feedback using a quad of 6L6 or 6550 for the output. Then use preamps, maybe from various amps, but I would add a cathode-follower to each one and feed each one through a largish resistor to a triode mixing stage, then to the power amp. I would use DC voltage for the preamp filaments and buy a 250V regulated supply, available cheap.
 
coap01
Junior tube assistant
Posts: 107
(3/5/04 8:57 am)
 good Q
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 i've been wondering about a good design for what you suggested as well. This is what i came up with.. and i'd appreciate if someone lets me know of any problems with this set up.

the preamp would end at master volume. at which point the signal would be passed to the power amp that would contain the PI, the PT, power supply filters, and the OT.

each preamp would have its own set of caps/resistors regulating the B+ voltages. that way i can use ONE power amp for virtually any preamp configuraiton.

and there would have to be some sort of a switching matrix to select which preamp the input signal goes to. so you wouldnt have to physically move the cable....now that i think about it this gets rather complex. maybe have the input and the swtich matrix inside the poweramp.

thats what i got so far. feel free to comment :)

--Lev
 
 
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