1974 Davoli Orbach B3 hybrid tube amp RARE!

2 x ECC82; 2 x EL500; 12" unbranded ceramic speaker 8R
It's rare... there are no pictures of this amp anywhere on the internet. The power section matches the schematic of the UNITA DE POTENZA 1040 from 1967, but the preamp is entirely solid state. It has a closed back cabinet and sounds very good for clean sounds.
#vintagetubeamp #davoli #EL500
00:00 Intro: stock demo
01:02 Identifying the amp
02:02 Power Transformer: 220V
02:35 Removing the chassis
04:00 Power circuit
07:15 Preamp & tone control circuits
08:30 Speaker
10:20 Preamp: a closer look
11:30 Buffer circuit
12:28 Replacing dead electrolytic caps
14:00 Testing voltages on the preamps
16:50 Biasing output tubes
20:03 Speaker jack
20:45 Rerouting preamp power
22:18 Final observations
23:37 DEMO: stock amp
24:55 DEMO: speaker with Geloso 215 (telecaster)
25:48 DEMO: speaker with Davoli D531-T (baritone)

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