Fi-Sonic

Phil Drioni, Cronulla NSW.
(per: Mick Liber, Dec 04)

New: 5/3/07

Phil Dreoni who made the Fi-Sonic had a shop in Marrickville, Sydney that he recently sold. Phil is still in contact with the guys there & they recently serviced my Fi there. The best contact there is a guy called Grey.
Source: Don Macleod, Upside Down Miss Jane (who are gigging the Fi and a Holden Wasp).

New: 20/1/08 Don also writes that Phil is still building amps to order.

Four inputs, two bass, two rhythm (like Goldentone)
Individual input volume controls
Treble, bass controls for both channels
Reverb control on far left (like GoldenTone)
Vibrato speed and depth
Neon pilot light
4 x 12AX7 preamp valves 
2 x 6L6-GC output (like Fender)
6GW8 Reverb driver (5K output transformer)
Built: ~1966
A&R output and power transformers
Speaker Rola 12UX twin cone
Construction and layout appears to be modelled closely on Fender combo.

The control panel layout however strongly echos a Goldentone. This looks like a good basic rig for guitar and maybe light keys.

Upside down.

At left 6GW8 and reverb spring line drive transformer; four preamp valves including phase splitter; twin 6L6's.

Note the cross-orientation of the (larger) power and (smaller) output transformers to prevent coupling 50Hz into the output.

What's the little valve hiding behind the power transformer? A gas voltage regulator perhaps? it's not a good idea to position signal valves where they can be modulated by stray magnetic fields.

The huge speaker magnet just in view is in fact a cover that unscrews over an alnico hoop.

Source: Retrovox

---

Source:

Source: e-bay

5wg practice amp

New: 20/1/08

Jeremy Shaw wrote (12/10/07) with these pix and a very welcome circuit tracing.
Errata: there should be a grounded centre-tap on the power transformer, I'm a bit dubious about the third diode, and the missing input resistance could be 1meg, but it's an outstanding first effort. Well done and many thanks.

Remember; the tracing you may think too rough to publish may contain just the clue somebody else is looking for.

<<<OzValveAmps