Picked one of these up for $10 that needed the input jack repaired, figured the box and
chassis would be worth it for a cheap tube build.
The front panel layout is good for a rebuild with a clean and overdrive channel, bass, mid,
and treble controls and a reverb control. There is a small reverb tank mounted to the chassis.
It has a very cheap looking 10" speaker, at least it is a decent size.
The baffle board is 11.5" tall and I think that if a notch were cut for the frame of a 12"
speaker might drop in and then fit - not sure. I strongly prefer a 12".
Fixing it stock for now. Turned out the PC board was cracked right at the input jack, so I
bridged the cracks with buss wire which fixed the amp - it works!
Pair of 3300uF/50V caps in the power supply, TIP41/42 (6A, 65W) output transistors that
are too small in my opinion. Many JRC4558 OP amps.
The clean channel seems weak with the tone knobs at 5, turning the mid and treble up to
8 helps a lot with volume. The reverb seems very weak with the guitar signal but bumping
the case makes a crash from the springs. Reverb tank says 2K input and 2.2K output Z.
Must be difficult to get enough drive from tiny OP amps. Perhaps it needs a recap?
Overdrive channel is very loud.
I've been working on several small SS practice amps and prefer a Fender and two Peavey's
that I have. But the chassis should work fine for a tube rebuild, perhaps even use the
reverb spring.
Anyone know if the weak clean channel and reverb are typical of this amp?
Anyone have a schematic?
chassis would be worth it for a cheap tube build.
The front panel layout is good for a rebuild with a clean and overdrive channel, bass, mid,
and treble controls and a reverb control. There is a small reverb tank mounted to the chassis.
It has a very cheap looking 10" speaker, at least it is a decent size.
The baffle board is 11.5" tall and I think that if a notch were cut for the frame of a 12"
speaker might drop in and then fit - not sure. I strongly prefer a 12".
Fixing it stock for now. Turned out the PC board was cracked right at the input jack, so I
bridged the cracks with buss wire which fixed the amp - it works!
Pair of 3300uF/50V caps in the power supply, TIP41/42 (6A, 65W) output transistors that
are too small in my opinion. Many JRC4558 OP amps.
The clean channel seems weak with the tone knobs at 5, turning the mid and treble up to
8 helps a lot with volume. The reverb seems very weak with the guitar signal but bumping
the case makes a crash from the springs. Reverb tank says 2K input and 2.2K output Z.
Must be difficult to get enough drive from tiny OP amps. Perhaps it needs a recap?
Overdrive channel is very loud.
I've been working on several small SS practice amps and prefer a Fender and two Peavey's
that I have. But the chassis should work fine for a tube rebuild, perhaps even use the
reverb spring.
Anyone know if the weak clean channel and reverb are typical of this amp?
Anyone have a schematic?