Peavey Bandit, Solo Series, 1981

[N_Cook]

Normal channel missing just mV of output, same with footswitch supposed
operation, lead ch is fine.
Seems to be a rare beast, any pointers to a schematic ?
Uses 4x rc4558 opamps ,2x SJ3692 in PA, seems to use an opamp and FET
for gating on and off "normal" gain channel. Swapped out the 4558s, as
socketed, no change.
Thought found prob on underside , one pot pin had never been soldered,
just touching contact and some ring crack failures or dodgey looking at
pots, but that was just the general crackly performance, clean ch still
absent.
o/p of one opamp is high, same with swapped version, goes to gate of the
FET, which will be the next thing to investigate, if no schematic found.
When last powered I did not think to see if the footswitch action gated
the opamp o/p. Any other ideas?

 

[Adam]

On 2017-03-17, N_Cook <diverse@tcp.co.uk> wrote:
> Seems to be a rare beast, any pointers to a schematic ?

Is this the one?

https://peavey.com/forum/download/file.php?id=14455

-- Adam

 

[Dave M]

N_Cook wrote:

Normal channel missing just mV of output, same with footswitch
supposed operation, lead ch is fine.
Seems to be a rare beast, any pointers to a schematic ?
Uses 4x rc4558 opamps ,2x SJ3692 in PA, seems to use an opamp and FET
for gating on and off "normal" gain channel. Swapped out the 4558s, as
socketed, no change.
Thought found prob on underside , one pot pin had never been soldered,
just touching contact and some ring crack failures or dodgey looking
at pots, but that was just the general crackly performance, clean ch
still absent.
o/p of one opamp is high, same with swapped version, goes to gate of
the FET, which will be the next thing to investigate, if no schematic
found. When last powered I did not think to see if the footswitch
action gated the opamp o/p. Any other ideas?

Send an email to Peavy at parts@peavey.com or customerservice@peavey.com and
ask if they can send you a schematic for your amp. They're usually quick to
respond. Give all the nameplate numbers on the amp to get the correct
schematic. They are (in)famous for making engineering changes to them and
not changing the model or Rev level.
Dave M

 

[N_Cook]

On 17/03/2017 16:30, N_Cook wrote:

Normal channel missing just mV of output, same with footswitch supposed
operation, lead ch is fine.
Seems to be a rare beast, any pointers to a schematic ?
Uses 4x rc4558 opamps ,2x SJ3692 in PA, seems to use an opamp and FET
for gating on and off "normal" gain channel. Swapped out the 4558s, as
socketed, no change.
Thought found prob on underside , one pot pin had never been soldered,
just touching contact and some ring crack failures or dodgey looking at
pots, but that was just the general crackly performance, clean ch still
absent.
o/p of one opamp is high, same with swapped version, goes to gate of the
FET, which will be the next thing to investigate, if no schematic found.
When last powered I did not think to see if the footswitch action gated
the opamp o/p. Any other ideas?

How often have I seen this. Everything seems to work component-wise
perfectly ok but something is not right. Its due to something I'm doing
wrong, either a case of RTFM (no ref to this in the owner manual) or
looking too logically at musician stuff.
The front panel has a specific section labelled Lead Gain with a line
extending out to the PRE pot and POST pot. The next section is marked
Normal Gain pot.
I was turning both "LEAD" pots to min for f/s engaging of normal and
vice-versa for lead channel, but there must be some advancement of the
POST pot for either channel to work, only seeing that in the schematic

 

[N_Cook]

On 18/03/2017 05:57, Adam wrote:

On 2017-03-17, N_Cook <diverse@tcp.co.uk> wrote:
Seems to be a rare beast, any pointers to a schematic ?

Is this the one?

https://peavey.com/forum/download/file.php?id=14455

-- Adam

Yes, thanks for that. The only number with the model type , on the
nameplate, is 82A, and the amp being rated 50W, no reference to 65
anywhere in the amp, c'est la guerre

 

slightly OT ...

is there a common response in qualifying specs to the naming of BANDIT BLASTER KILLER AMP DOA SONIC GUN et al .....

is this quality ? quality what ? R&R Hard Rock Virgil Fox ? I'd guess that is the intended market but does that work or is the naming just a ploy for cheap outputs

 

On Friday, March 24, 2017 at 9:03:51 AM UTC-4, avag...@gmail.com wrote:

slightly OT ...

is there a common response in qualifying specs to the naming of BANDIT BLASTER KILLER AMP DOA SONIC GUN et al .....

is this quality ? quality what ? R&R Hard Rock Virgil Fox ? I'd guess that is the intended market but does that work or is the naming just a ploy for cheap outputs

goo.gl/z03QKX

 

On Friday, March 24, 2017 at 9:09:26 AM UTC-4, avag...@gmail.com wrote:

On Friday, March 24, 2017 at 9:03:51 AM UTC-4, avag...@gmail.com wrote:
slightly OT ...

is there a common response in qualifying specs to the naming of BANDIT BLASTER KILLER AMP DOA SONIC GUN et al .....

is this quality ? quality what ? R&R Hard Rock Virgil Fox ? I'd guess that is the intended market but does that work or is the naming just a ploy for cheap outputs

goo.gl/z03QKX

LOCAL NOISE sez naming here is aimed at a specific age and cultural group ... we can live with this...but what does the oscilloscope say ?