Recent content by SPH

I see what you did there.

Final parts turned up. Well, all except for 2 wire wound 8R2 resistors. I already had some 1w film resistors in that position from the not-so-great local store order. I'll replace them as soon as they turn up. I got the output transistors replaced too, new isolation washers and heat shrink on...

Aaaand if you want a quick laugh here's me jabbing a multimeter into a powered up amp. Only one spark. Oh, timH, the caps are 63v.

Yeah, ok. That sounds promising. Mains is reading 250v. *edit* 250v!? I must be remembering that wrong. I'll go check after tea. Checked, yep, 251vac. That is juuuuust within the acceptable limits.

Ok guys, I've finally knuckled down and got the caps installed. I crossed my fingers and fired it up. Nothing caught fire! Nothing even went pop. So far so good. I'll throw out some numbers and hopefully you guys can let me know what's what. Everything is not as it should be, I think. Across...

Sorry, I was being a bit vague again. I said 'look to be working', what I meant was 'have been tested and are working'. The reason I was chasing replacements is that it's s lot easier to have the parts and not need them than find I need them and have to wait/pay postage on yet another parts...

Yes, I have a couple.

No arguments from me. The diodes in place look to be working but there are stories here and on other sites of them giving out on initial power up. I'm not in a rush to replace parts I don't have to. I'll get the caps installed, stick a light bulb in series with the mains and see what I get.

Will something like this work to replace the 4 Schottky diodes?

I was getting th psu caps installed tonight and realised I'd forgotten the LM340T24 voltage regulator. Element14 has a 12v version but no 24v. They suggest this as a replacement. Thoughts?

That'd be great. I should be ready to test in a couple of weeks. Just ordered a new MM so I can test my trasietor pairs.

Yeah, easy to get. I just had to wait and see which parts turned up from the local supplier. They were a bit of a lucky dip. They seemed to have a knack for not finding direct replacements on E14 (where most of their parts come from). I got silver mica caps instead of styrene's, for instance...

Got any pictures of the rebuilds? I'd love to see one of them! I'm still chasing wire wound resistors and some ZTX753's. I need to get the hfe checked on my transistor pairs too. I might need to order a bunch and get someone local to check them. Or check the originals for that matter. I...

I'm using a pair of bc549c's. The only matching that's been done is checkin that they both have bc549c printed on the flat side. I did know previously that these were supposed to be a matched pair but I have no way (that I know of) to test the values. I could reuse the originals I guess, I'd...

Can anyone tell me what to substitute for the ZTX384C's? The transistor that piggyback's on the heatsink for the MJE243. I can't find a part that's still in production and readily available.