Quad Help!

[spendorman]

Probe for testing as in 4th para of course needs to be a conductor, so metal is Ok, but the probe for para 5 could be something else.

[spendorman]

The tt is a Technics sl-3, with an mm cart. Yes, it does work through the Denon.

When you say incorrect wiring, what do you mean? By me or in the Quads? It has been working prior to my getting it. Although, a p hone call over the next day or two will be made to confirm lots of detail I don't have at the moment.

So TT is OK, mm cart OK for 33.

You have other equipment so its not that you will be without music. Perhaps have a word with previous owner. Get a cable so that you can check out power amp without using 33.

You could do the metal probe thing into the tape replay socket/ tuner socket and listen for hum.

Are you sure your Din plugs into the 33 have the right pins connected?

[symon]

Yeah. First things first - make the phone call. I have heard music through these so I know they have worked recently.

Oh, and I don't have a cdp with a volume control. So, I guess the only other test I can do is to use my Denon as a pre amp.

[spendorman]

When it's going, I would recommend for sound quality, replacing the op amps with TL071, it makes a big difference, going to exotic ones does not do much more and may need other changes (IMHO). TL071 are very cheap. Just make sure that they go in the sockets (most 405 boards had sockets) the right way round.

The 33 is not bad, but it certainly limits the performance of my well adjusted 303's. For years I did not realise how good the 303's are until I bypassed the 33. The 44 also limits the sound quality (again IMHO).

That is not to say that the 33 and 44 are really bad.

[symon]

Well, they should be a step up for me - once I get them working!
I'll see about fiddling inide when I feel more confident about it. At the moment I don't really know what you mean. Which is fine. I can learn about that another time.

From memory, I'm sure they have been serviced within the last year or two, so there really is no reason why they shouldn't be working.

As for the leads, as far as I can see there isn't a way to connect them incorrectly. And, as I say, it worked before they worked before I got them - using the leads I have now apart from the kettle lead for the 405.

The only thing I have found which seemed to be slightly wrong was the cards inside the 33 being loose.

[spendorman]

So you are using the same 5 pin Din input plugs/ leads that the previous owner used? How many?

The op amp change is easy, there is only one 8 pin chip on each board.

My fav amp in about 40 years of messing with Hi Fi is Radford STA25 valve amp, wonderful.

[symon]

1 x 4 pin to 4 pin, and 2 x RCA to 5 pin.
Again, if I remember right these were made for this set up.

[spendorman]

So it's unlikely that both RCA to 5 pin Din are faulty, presume that you tried both.

[symon]

Just out of interest, what should I get to do a proper test of the cables? (ie, other than a bulb and a battery!)

[symon]

So it's unlikely that both RCA to 5 pin Din are faulty, presume that you tried both.

Yes, I switched them around and have unplugged them and mixed them up quite a few times.