jchrisf
Well-known member
I recently finished my first build. It's the Mojotone Brit 50. It sounds great and is the nicest sounding amp I've ever played. But my voltages are not really close to what the schematic is showing.
I'll put what the schematic shows in parenthesis:
344 AC off the Power Transformer (not sure what it should be)
418 DC after the Rectifier (442)
416 Power Tube PIN3 (440)
418 Power Tube PIN4 (435)
225 V3 PIN 1 (350)
217 V3 PIN 6 (345)
175 V2 PIN 1 (282)
306 V2 PIN 6 (386)
222 V1 PIN 1 (345)
262 V1 PIN 6 (292)
3.09 V1 Cathode PIN 8 (2.4)
1.92 V1 Cathode PIN 3 (3.45)
My Heaters are showing 3.09 AC with chassis ground except V5 is 3.14.
I was concerned about this until I opened up my Ceriatone 2204 and measured those voltages. This amp is built by Ceriatone and the voltages in it are pretty much like mine. Since these voltages are close and the kit sounds so good I'm not worried about it.
But I am curious what would cause them to be off from the schematic? And if they were closer to the schematic, how different would it sound?
I'll put what the schematic shows in parenthesis:
344 AC off the Power Transformer (not sure what it should be)
418 DC after the Rectifier (442)
416 Power Tube PIN3 (440)
418 Power Tube PIN4 (435)
225 V3 PIN 1 (350)
217 V3 PIN 6 (345)
175 V2 PIN 1 (282)
306 V2 PIN 6 (386)
222 V1 PIN 1 (345)
262 V1 PIN 6 (292)
3.09 V1 Cathode PIN 8 (2.4)
1.92 V1 Cathode PIN 3 (3.45)
My Heaters are showing 3.09 AC with chassis ground except V5 is 3.14.
I was concerned about this until I opened up my Ceriatone 2204 and measured those voltages. This amp is built by Ceriatone and the voltages in it are pretty much like mine. Since these voltages are close and the kit sounds so good I'm not worried about it.
But I am curious what would cause them to be off from the schematic? And if they were closer to the schematic, how different would it sound?
