2chanell PCL86-PP "tube buster" for guitar - diyAudio
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Old 28th November 2009, 07:19 AM   #1
davorin is offline davorin  Croatia
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Default 2chanell PCL86-PP "tube buster" for guitar

Small 2-channell amplifier with 4xPCL86 tubes (2x14W) for build in full solid-state guitar amp (HOHNER Force-CD400sc). Also replaced original speakers with 2 CELESTION-super8 speakers.
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Old 28th November 2009, 07:33 AM   #2
davorin is offline davorin  Croatia
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Sound is now very closed to "all tubes" amplifiers, although pre-amp, reverb and chorus are solid-state (ships). With small modifications can use ECL86 (6GW8) tubes, but PCL86 are much cheaper!
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Old 28th November 2009, 07:45 AM   #3
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There's another nice one

Do you get enough gain with just the PI being the input stage?

Cheers!
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Old 28th November 2009, 08:25 AM   #4
davorin is offline davorin  Croatia
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Yes, I have enough gain (NO overall feedback!). There is 2 original (stereo?) pre-amp outputs at back side of chassis. The third pre-amp mono output I created with 2 resistors 47kOhms from both channels. For full power(14W/4%THD) amps need ~1,5Veff.
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Old 29th November 2009, 10:43 PM   #5
jjman is offline jjman  United States
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Does having 100k (pot) across the input, and therefore the guitar's pickups, load down the signal too much at that point? I guess active PUs wouldn't care.
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Old 30th November 2009, 01:21 AM   #6
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Quote:
Originally Posted by jjman View Post
Does having 100k (pot) across the input, and therefore the guitar's pickups, load down the signal too much at that point? I guess active PUs wouldn't care.
It would chop the treble on high output overwound passives, but if your pickups are silly bright already, it can even things out some.

(bassists will load their pickups as low as 4.7K and boost the gain to get a "Hofner" tone for instance)

Cheers!
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Old 30th November 2009, 04:21 AM   #7
davorin is offline davorin  Croatia
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Output impedance from basic pre-amp (Höhner) is ~10Kohms (Uout is ~2Veff). Potentiometer 2x100Kohm is something like master volume, but it is here only to set correct level to output amplifiers. Value of 2x250Kohm give me more gain and bass, but I do not need them.
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