Hello,
I am the happy owner of a bruno putzey's balanced preamp, that i bought here along a vicol audio "maya" controller plus a "hans pcb".
I use it for several years without problem as my daily pre, after that i built a dam1941 and used the integrate volume controller, no i nearly stop using the bpbp but keep it "in case". Approx 6 month ago i get a new chassis for it, to make a cleaner build. I tested if everything was ok and it was working fine. A few days ago i assembled a dsc dac, so i needed a volume controller. Surprise, the bpbp wasn't working, so i did some check.
The first input have a very low sound, second input no sound at all. The maya is powering up but changing the attenuation doesn't do anything, i also don't hear the usual little "click" noise of the relays in the hans board when i change the attenuation. I check the connection but i don't see any problem... and again nothing changes since the last time when it was working.
In my build i use a custom transfo with 13v dual and the hypex low noise reg. Speaking of the hypex reg, they seems to power up as usual as the led are powering up.
Also i don't have much equipment to test it except a multi-meter, do you have some advice to debug the problem ?
Thanks
I am the happy owner of a bruno putzey's balanced preamp, that i bought here along a vicol audio "maya" controller plus a "hans pcb".
I use it for several years without problem as my daily pre, after that i built a dam1941 and used the integrate volume controller, no i nearly stop using the bpbp but keep it "in case". Approx 6 month ago i get a new chassis for it, to make a cleaner build. I tested if everything was ok and it was working fine. A few days ago i assembled a dsc dac, so i needed a volume controller. Surprise, the bpbp wasn't working, so i did some check.
The first input have a very low sound, second input no sound at all. The maya is powering up but changing the attenuation doesn't do anything, i also don't hear the usual little "click" noise of the relays in the hans board when i change the attenuation. I check the connection but i don't see any problem... and again nothing changes since the last time when it was working.
In my build i use a custom transfo with 13v dual and the hypex low noise reg. Speaking of the hypex reg, they seems to power up as usual as the led are powering up.
Also i don't have much equipment to test it except a multi-meter, do you have some advice to debug the problem ?
Thanks
Do you have the schematic for the preamp? Do you have any test equipment for troubleshooting (a DVM and or an oscilloscope)? Experience troubleshooting? Without knowing more about those things, it would be hard to suggest something for you to try.
Clearly i have no experience in debugging electronic stuff, and i have no equipment.
For the schematic everything is here on the forum, the BPBP and hans pcb are well known. For the vicol maya i suppose there is no schematic.
My uneducated guess is the problem doesn't come from the bpbp or hans pcb. The maya control the switching of the bpbp input and the relays of the hans pcb. The fact i have no sound when i connect something at the input 2 seems to indicate the maya do not toggle input 2, same for the hans pcb, attenuation is stuck to maybe -40 or -45 db.
For the schematic everything is here on the forum, the BPBP and hans pcb are well known. For the vicol maya i suppose there is no schematic.
My uneducated guess is the problem doesn't come from the bpbp or hans pcb. The maya control the switching of the bpbp input and the relays of the hans pcb. The fact i have no sound when i connect something at the input 2 seems to indicate the maya do not toggle input 2, same for the hans pcb, attenuation is stuck to maybe -40 or -45 db.
Attachments
Not even a cheap DVM? Do you read schematics okay? Reason I ask such things is that there are ways people used to troubleshoot audio gear with little in the way of test equipment. For example, sometimes they used 'signal tracers' and or 'signal injectors' to try to narrow in on a problem. A spare preamp or instrument amp might be called into service as a signal tracer. Otherwise you are left with visual inspection, swapping parts, that kind of thing.