TC-7240 RCA/PHONO switcher

Nice design Stan, the front panel reminds me of a mini Densen Beat amp.
:)

Nice look for your nextgen Dac.

No idea on price, but it won't be more than £99.99 inc VAT and delivery. Like the TC-7220, the TC-7240 are hand built for quality purposes and silver solder used. The price of that solder has risen a lot lately.

I'd be more tempted to call it a universal switcher Stan ;)

I remember that before i owned this ARC MP1 i switched between a Classe DR5 pre amp & a Harmon Kardon AVR5500 (using the front channel pre outs) to my power amps. There is no reason it couldn't be used for the very same purpose, & i'd have been much happier using a nice shielded metal case jobby with quality connectors than what i was forced to use :rolleyes:

Things like this are not really available in any guise of quality, good luck to you - you shouldn't imo just call it a phono switcher though... Don't categorise it, it can switch between just about anything at the end of the day ;)

Would be great for all those T-Amp enthusiasts out there who only get one measly input... Good luck with it, Stan.

Hi Stan,
Forgive me if this is a daft idea, but couldn't you add a volume control and make a brill Beresford passive pre amp?

I could add a volume control, but then it wouldn't be what it is supposed to be ;). The main problem is that high quality volume control pots don't come cheap. So before you know it the whole thing becomes a lot more expensive, and specialized due to the higher prize and functionality.

http://www.homehifi.co.uk/aos/TC-7240S.gif

Quote:

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Originally Posted by StanleyB

I could add a volume control, but then it wouldn't be what it is supposed to be ;). The main problem is that high quality volume control pots don't come cheap. So before you know it the whole thing becomes a lot more expensive, and specialized due to the higher prize and functionality.

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Hi Stan,
You might be interested in this: -

http://www.ebay.co.uk/itm/1pc-Japan-...item336bef305b

My builder, who knows his stuff, has used one on a build for me. He thinks they are genuine and has promptly bought 5 himself after seeing mine. I have a spare if you would like me to send it on to you for a look.
Cheers,
Dave.

I agree about the cost of decent volume pots/attenuators, especially if you need a high value one. The DACT attenuators are about the best value I've seen so far and a stereo wired 500K one is still around a ton...

Stan, couldn't you make 2 versions; one as described and another, to special order, with a potentiometer at a higher price? Just a thought and then you could please everybody!

A low value pot of around 10K would be required otherwise the output impedance will be way too high. Even 10K is high from that point of view but a lower value pot won't attenuate enough.

A passive attenuator version might be a good idea though as a lot of people use passive attenuation these days. You would just need to provide details (on your website) of how prospective customers can check if their system is compatible with a passive attenuator. That way you should avoid the situation where people are disappointed with the results due to them having impedance mismatch issued.

Then perhaps later you could develop a budget buffer stage similar to the Pass B1. I think there's a gap in the market for a well made, no frills, British engineered but competitively priced buffer. Most of the cheap ones are nasty Chinese things. :)