bogadocarlos
New Member
Hi All,
I bought a very nice condition BA-303. Amazing tube amp with four KT88 on triode connection.
Apparently never was used, was in a box by 20 years, all original and the only problem was a resistor on V4 KT88 that was broken.
I'm testing it, the sound is incredible, but I have a problem with BIAS setting. The BIAS meter is not functioning or, maybe, is not well seted.
I was reading on net about to set AC BIAS first and then set V1 to V4, but I don't know the procedure for it.
I have the schematic and there is two pots (VR11, 1K and VR12, 10K ohms) that can adjust AC BIAS, but I don't know wich to use. Sorry because I'm not a technician and sure I'm having a mistake.
Somebody know the procedure or have user or maintenance manual of this amp?
Some help will be very appreciated.
I bought a very nice condition BA-303. Amazing tube amp with four KT88 on triode connection.
Apparently never was used, was in a box by 20 years, all original and the only problem was a resistor on V4 KT88 that was broken.
I'm testing it, the sound is incredible, but I have a problem with BIAS setting. The BIAS meter is not functioning or, maybe, is not well seted.
I was reading on net about to set AC BIAS first and then set V1 to V4, but I don't know the procedure for it.
I have the schematic and there is two pots (VR11, 1K and VR12, 10K ohms) that can adjust AC BIAS, but I don't know wich to use. Sorry because I'm not a technician and sure I'm having a mistake.
Somebody know the procedure or have user or maintenance manual of this amp?
Some help will be very appreciated.