It’s the 125th installment of the Truth About Vintage Amps with Skip Simmons!
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Some of the topics discussed this week:
:51 Skip works on a Jim Kelley Amp, built-in attenuators, the magnetic field caused by a Tweed Bassman speaker
3:30 Skip needs an RCA MI-12155 schematic
3:56 Making stuff for the Bay Area Guitar Show
8:12 The Dad joke that won the Voltic DTF pedal: Keith F with “Why did Skip have to marry Mrs. Simmons? From the day he solder, he couldn’t resistor.”
9:34 A basic servicing check-list of what to do when you get a vintage amp
15:36 An early 1960s Tweed Princeton branded Harvard, tensioning the input jack
22:22 Modar-branded guitar amps; tube lineup of EF86, 6BQ5, EZ81
23:51 Trainwreck amplifiers; the tone difference between a single 8 ohm secondary winding vs four separate 1 ohm coils wired at 8 ohms
25:47 Should I buy this Peavey Triumph 120 combo?; five-pin footswitch replacement
28:15 Dummy load vs speaker when working on amps
30:55 How to replace the battery circuit on a Bogen E66 portable PA, ice cream truck-specific amps, the Fretboard Brewery
35:45 5Y3 rectifiers, demystified
39:00 Rancho Gordo beans, redux
39:46 An inspiring 1966 Champ and a vegan pumpkin pie
45:24 A hi-fi Eico ST-84/Dynaco ST-70 with the balance way off, RIP Earl Yarrow
55:22 Servicing a Carr Mercury; 12AT7 versus 12ZX7 pre-amp tubes
1:01:04 What to do with a 1980s Fender 30 with a weak second channel? a rare Ampeg B-15N
Hosted by amp tech Skip Simmons and co-hosted/produced by Jason Verlinde of the Fretboard Journal.
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Above pic: Listener Bryan M’s tweed Harvard/Princeton, as discussed on this week’s episode.