
They all still work ok. TUAC were always changing their circuit designs. I've got 5 TD150 amp modules that are all different, ranging from a few resistors to number of transistors
I have a TD300 amp which is just a TD500 with a pair of output transistors omitted
Both should be 6.3a TD
I would check those smoothing caps on the rectifier boards they would have both been the same and TBH they look well old
Yes. Thanks, I will get some new components today but not the 330pf. Must order again. Some components have the wrong value on board. so I will try follow it around and check. Where do you find the R33 wirewound resistors?
Farnell have a good range but if you don't have an account you may prefer Amazon who seem to have lots.
These would do, they have some that would be a better choice but not on Prime.
https://www.amazon.co.uk/YOKIVE-Resistors-Resistor-Tolerance-Electronic/dp/B0BNBF8CY6/ref=sr_1_9
These are 2W and quite small.
If you plan to drive 4R loads for long periods then you could use 4 in place of each original resistor (2 parallel pairs in series).
I didn't like the look of the 3W carbon film ones at Amazon but the 5W "cement" ones would be OK if you don't mind waiting.
MK
There's a row of 3 r33 wirewound resistors down each side next to the power transistors. I bought some off eBay
OK, ty. but i wonder where on the circuit board, I've been looking but cant find those you talk about. Aaa, ok it says a dot and 3 ohm on the circuit diagram? So the other one will be 66ohm? I have mesure them and thay seems to be 4-6 ohm.