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  1. K

    HELP !! Please Leak amplifier

    I insert baxandall tone stack into the leak tl/50 amp. but it's not working. When I remove the ground wire the amp plays fine. see the schematics here: http://www.44bx.com/leak/Leak/Circuits/tl50_ecc83.JPG I placed the baxandall between the ef86 and the 12ax7 and all values are the same except...
  2. K

    Help! No Bass Leak TL/50

    I build the Leak TL/50 from scratch, point to point, following the schematic. Some of the voltages are a bit high: EF86 165 (should be 150); 12ax7 315v (should be 300) Kt88 plates 478- cathode to plate voltage 425v. across cathode 45v ;resistor ohms 493. The treble is wonderful but the bass is...
  3. K

    Help Shock! Please

    I built the Mullard 2 valve preamp but whenever the power amp is on and I try to this connect the audio cable from the preamp or the power amp (Mullard5-20) it provides a nasty shock. Mullard did not mention this; but Stern built the same preamp and clearly stated that there will be an electric...
  4. K

    WOW. Help! Monster Amp

    I love this schematic by David Hafler(dynaco). It seems easy to build. Anyone knows of a amp using this this schematic. https://www.pearl-hifi.com/06_Lit_Archive/02_PEARL_Arch/Vol_01/Sec_02/145_120W_HiFi_UL_Pwr.pdf Please advised: Is it a good schematic;any good good or bad thing said about...
  5. K

    Please !!! Help mullard prep

    I build the mullard 5-20 and now I am building the 2 valve preamp. The power amp schematic shows where to connect the B+. Should I have three wire connections going to the preamp from the power amp. the B+,signal ground and earth ground. Or should I have only two the B+ and earth ground. And...
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