#1 And another amp, all indirectly heated
Posted: Wed Mar 18, 2020 5:01 pm
Just put this together last weekend
It had it's first run on my main speakers today. It sounds very nice
It's not quite the px4 sound, but it's very close. It's a bass monster mainly due to the driver valves. Early ac/hl do have a dark tone. Plays double bass beautifully.
The 2k sowter transformers are a little thicker in the bass too and not quite as airey as the tributes.
It's output valve is the Mazda pp3521 it's sort of an indirectly heated cosser 2p valve, the anode looks identical, 2.3 watts output. The pair you see where part of a group buy around 5 years ago ( thanks paul) and have been quietly awaiting some ac/dc application.
The output valves are on a dc heater supply, the black box on the front right running around 33 volts. It needed an extra cap close to the valves to silence a little hum, the amp is reasonably quiet.. but i could do better with it !!
The power supply is again a single tx split 4 ways.
It had it's first run on my main speakers today. It sounds very nice
It's not quite the px4 sound, but it's very close. It's a bass monster mainly due to the driver valves. Early ac/hl do have a dark tone. Plays double bass beautifully.
The 2k sowter transformers are a little thicker in the bass too and not quite as airey as the tributes.
It's output valve is the Mazda pp3521 it's sort of an indirectly heated cosser 2p valve, the anode looks identical, 2.3 watts output. The pair you see where part of a group buy around 5 years ago ( thanks paul) and have been quietly awaiting some ac/dc application.
The output valves are on a dc heater supply, the black box on the front right running around 33 volts. It needed an extra cap close to the valves to silence a little hum, the amp is reasonably quiet.. but i could do better with it !!
The power supply is again a single tx split 4 ways.