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  1. H

    5f4 Super inspired build numbers check

    Please ... Built from my stash of stuff , organ trannies so voltages are a little high . Plate voltage for each tube is 457/455 vdc Plate current is .047/.050 ma Plate dissipation is 21.48/22.75 w . I built this with an adjustable bias supply and it is set to -44.7 This works out to 72/76...
  2. H

    Check my schematic help mod / tweak please SE 6v6

    Just built this amp and would like some input please . It is a single ended 6v6gt output with 12ax7 pre and SS rectification . As it sits the tone is a little ratty sounding , harsh . Kind of a princeton amp but with different cap and resistor values . I used what was in arms reach and junk...
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    Scrounged power transformer CT question

    I have a PT from some old gear that I parted out . Total of 6 leads . Two for primary , two for secondary HT @ 500 vac and two for secondary filament @ 6.3vac . No center taps . Had it wired into a single ended circuit with a SS bridge rectifier and it got hot immediately so I shut it down ...
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    SE reel to reel OT for 6v6

    An OT that I have from an old tubed reel to reel . When removed I marked it "6v6 x 1" with a sharpie . When I do the math to determine speaker impedance I get leads for 16 ohms and 64 ohms . Black and Yellow 16 ohms Black and green 64 ohms Is it possible to use the black and tie the green...
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    Interchangeable tubes ? 6v6/6l6/el34/7591?

    I thought I read somewhere here on the site that an amp can be built using the pinout for an el34 tube in the output section and that other tubes may be used in this position such as 6v6gt , 6l6gc , 7591a . Looking for a confirmation on that . I looked up the pinout for these four tubes and see...
  6. H

    Flat Tire

    Recorded into pro tools . I play everything on this track . From 20 years ago . .
  7. H

    Hammond Organ Chassis AO 68-1 conversion

    I acquired this amp many years ago and tried to convert it for guitar use . My skills were sad at that time and to be honest I'm just a little bit better now . At least I don't burn my fingers with the soldering iron any more ...well not much anyways . So I pulled it of the shelf and re-gutted...
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    Sounded good until I started messing with it ...

    I re-built a circuit into an old chassis with what I had hanging around . Sounded pretty good until I tried adding a presence control and that's why I am posting . One of the parts I had hanging around was an old Hoffman Stout turret board . It was probably my first or second build and it never...
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    What to do with 3 inputs ?

    I built a sort of 5e3 based amp into this old solid state chassis that I gutted . It has 3 inputs and I was wondering if I could get three different input choices . At the moment I have an input that I copied from the Hoffman "Stout" schematic that I like . It uses the 1 meg resistor to ground...
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    Airline 9013a tune up

    Working on this amp for a friend . Thought I would post some pics as it seems to be all original and there is not much out there about these amps . Looking over the amp and schematic that is posted online I have been able to go through the amp . I also used the Silvertone 1472 schematic for...




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