matta
Well-known member
Hey Guys,
I've posted this over at Geoff Tanner's place but thought I'd try here as well as someone is bound to know. I know that Joel (Rascal7) and TK off the top of my head have had experience with these cards... so here goes...
I'm currently in a refurb job for a client who had some old 1271 amps. They had the 31267's on inputs (I'm using a single primary and secondary to wire as a mic input) and LO 1166's on our with a B183, half stuffed, so B183AM (I've since made it an AV). I'm doing a custom job and racking them up as pres using the JLM Hot Rod Mod and Joe's Go Between kits for +48V, Polarity and a Pad.
I've worked on other modules before using the B283's, which to the best of my knowledge were the same as the B183's only smaller with a different component layout/overlay, and according to the documentation I have one or 2 minor differences, i.e bigger caps and one or 2 resistor changes and the Neve call sheets call for either one.
Here is the perplexing part...
If I look at the B183 boards Pin J is not connected to the 2N3055 Base as it is in the B283 cards. It does seem that there is provision for a jumper that could take the base of the 2N3055 to Pin J, bu on all 8 original cards I have there is no jumper and it looks like there never was one as there is no solder or flux residue and if I recall Pin J went to ground.
Here are pics of the cards:
B283
B183
Can anyone shed any light on this for me? Should there be a jumper on all 8 cards that has been omitted? Just confusing as these were apparently 'working' modules, though untested by me.
Thanks in advance
Cheers
Matt
I've posted this over at Geoff Tanner's place but thought I'd try here as well as someone is bound to know. I know that Joel (Rascal7) and TK off the top of my head have had experience with these cards... so here goes...
I'm currently in a refurb job for a client who had some old 1271 amps. They had the 31267's on inputs (I'm using a single primary and secondary to wire as a mic input) and LO 1166's on our with a B183, half stuffed, so B183AM (I've since made it an AV). I'm doing a custom job and racking them up as pres using the JLM Hot Rod Mod and Joe's Go Between kits for +48V, Polarity and a Pad.
I've worked on other modules before using the B283's, which to the best of my knowledge were the same as the B183's only smaller with a different component layout/overlay, and according to the documentation I have one or 2 minor differences, i.e bigger caps and one or 2 resistor changes and the Neve call sheets call for either one.
Here is the perplexing part...
If I look at the B183 boards Pin J is not connected to the 2N3055 Base as it is in the B283 cards. It does seem that there is provision for a jumper that could take the base of the 2N3055 to Pin J, bu on all 8 original cards I have there is no jumper and it looks like there never was one as there is no solder or flux residue and if I recall Pin J went to ground.
Here are pics of the cards:
B283
B183
Can anyone shed any light on this for me? Should there be a jumper on all 8 cards that has been omitted? Just confusing as these were apparently 'working' modules, though untested by me.
Thanks in advance
Cheers
Matt