Radfordman
pfm Member
Differences that I have noticed, and there are probably more;
1/ The front panel, no Wattage input stated.
2/ Main heatsink fins much thinner than later models.
3/ Discrete rectifiers instead of the block AEI type bridge.
https://flic.kr/p/drFCdb
4/ The big power supply and speaker coupling capacitors seem to last and last, not like the blue coloured ones.
5/ Slightly different paint shades, but then Quad paint was a bit variable.
(lower left is the early 303)
https://flic.kr/p/MfReBx
6/ The output transistors are marked RCA 2N3055, later models are marked RCA 38494
I'm not taking the 303 apart today to check the mark 1 boards. Had enough of that. I'm enjoying listening to the 303 instead!
1/ The front panel, no Wattage input stated.
2/ Main heatsink fins much thinner than later models.
3/ Discrete rectifiers instead of the block AEI type bridge.
https://flic.kr/p/drFCdb
4/ The big power supply and speaker coupling capacitors seem to last and last, not like the blue coloured ones.
5/ Slightly different paint shades, but then Quad paint was a bit variable.
(lower left is the early 303)
https://flic.kr/p/MfReBx
6/ The output transistors are marked RCA 2N3055, later models are marked RCA 38494
I'm not taking the 303 apart today to check the mark 1 boards. Had enough of that. I'm enjoying listening to the 303 instead!