Golden Tubes: AMPS

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Tube Biasing 101 (Pt 2): 12AX7 bias chart!

What you need really is my ideal Bias point chart: This is the Bermuda Triangle of Tube Biasing: There is really no single ideal bi...
Tube Biasing 101: (Part 1) Biasing a 6922

oh oh, I've seen schematics like this before, and he's driving the 6922 too hard: taking it over its dissipation-wattage ratin...
Free Bass Speakers

What can be better than to look in the garage, and find a subwoofer cabinet with old bass speakers, ready for a reconditioning and new sta...
Making the Good Better: NHT 1.2 Speaker Upgrade

A friend who reviews speakers once described the NHT line of speakers from the 1990s as "nothing special" . Of course, he was u...
Fender Rumble 60 Upgrade

I just inherited this Rumble 60 , and I note it seems to have an 8 ohm Fender Special musical instrument speaker . However, this speake...
Kenwood JL-545(B) Rebuild

I was at the cash/pawn shop, and listened to a pair of speakers, A/B the JL-545B against some more recent but maybe also cheap 'digi...
Ultralinear Guitar Amp (10): Transformers, Grommet!

Transformers, Grommet! Yes, whenever you mount transformers to a chassis, always have plenty of rubber grommets to pr...
RIAA Preamp Build (part 4): 2-stage standard

Lets look at a basic 2-stage RIAA preamp from the early 50s. As expected, the RIAA EQ will be inserted after the first stage, where hea...