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> - do you know if and where i can find a RI schematic?
As Dave said, you can get the schematic at the Fender Mr. Gearhead site
here:
I've never really taken a look to see what, exactly, is different between
the original 6G15 circuit and the reissue, but there are differences.
> - I just studied the schematic again, and i noticed a choke (with two
> filtercaps) between the rectifier stage and the hotline, or whatdoya
> call it) - yet, I don 't think i've ever seen it on a chassis? is it
> inside? do you know what choke it is?
That choke is located on the backside of the chassis - the choke and the
reverb transformer are attached to the back of the chassis, so you can't see
them unless you take the entire chassis out of the cabinet. I think that
the 6G15 choke corresponds to Fender part number 125C3A - that has an
inductance of 4.0 Henries and a DC resistance of 150 ohms. If you want to
be absolutely sure, I can pull my RI chassis out and check - not a big deal.
While we are on this topic, I'll throw in an unsolicited thought (you made
me think about it by looking at the original 6G15 schematic). The original
units used a half wave rectifier that makes a pretty rough DC voltage, and
must really be filtered well. The 6G15 circuit that I built uses a full
wave bridge rectifier (from Hoffman Amps) that works really well - the
voltage is about twice as smooth as the half wave circuit, and it's not
expensive at all. For anyone thinking about duplicating the 6G15 circuit,
I'd go that route. Just my $0.02.
Let me know if you have any more questions on this - neat thread ;P
-Dick
