FS: BBC am9/19 mic amp modules

[mrclunk]

BBC mic and line modules.

AM9/19b
http://www.bbceng.info/ti/eqpt/AM9_19.pdf

Very nice transformer based pre's.
They run on +/- 12VDC but can be run on higher rail voltages if you change a hand-full of resistors.
I've done the maths to run on +/-16vdc but haven't actually tested it.

I'll provide all the docs with them and details of various mods.

I've also designed a little pcb that fits inside the modules to provide switching for +48V, polarity, input pad and the high pass filter.
It uses sub-miniature pcb mount toggles and a couple of Panasonic relays. Gives  four switches just above the gain control.
I'm waiting on the prototypes from china, but when i get the final batch i'll let buyers know. They'll be about £7 each.
I have these listed on ebay also.

£100 each plus shipping.

AM7/13A Line modules.
You can use these as mic amps too with a resistor change, great on drums in my experience.

£60 each for untouched ones
£75 each for ones that i've added a gain control too.
thanks
Paul

mr clunk g mail

 

[Ricardus]

Interesting.

 

[Sinkia]

PIC ?

 

[mrclunk]

Think ive sold them all now anyway. ..

 

[jamierichards7]

Hi, I've just got hold of some AM7/13 high gain line amp modules (with power supply).  I haven't had a chance to look at them properly yet but I was wondering if you would mind sharing any info regarding what you did to modify them for studio use? Which resistors did you change and how did you add the gain control? 

Any help much appreciated.

Cheers,

Jamie

 

[mrclunk]

Hi, I've just got hold of some AM7/13 high gain line amp modules (with power supply).  I haven't had a chance to look at them properly yet but I was wondering if you would mind sharing any info regarding what you did to modify them for studio use? Which resistors did you change and how did you add the gain control? 

Any help much appreciated.

Cheers,

Jamie

Yeah of course.
Ill send them over when i have a mo.

 

[jamierichards7]

Yeah of course.
Ill send them over when i have a mo.

Hey, Just a reminder about this..

Thanks

 

[mrclunk]

well reminded.
Basically u stick a 600ohm resistor across the input Tx primaries and then make switched resistor ladder for gain control.

 

[jamierichards7]

Thanks! Don’t suppose you still have the schematic?

 

[mrclunk]

Ill stick them in the tech docs

 

[smmpcomposer]

Ill stick them in the tech docs

Hi, I know it's a long shot, but do you still have the schematics for the AM7/13? Thanks!