Hi guys, my SCHA has served me very well since I made it. But I'd like some advice about putting a small power amp inside the SCHA's enlosure, either the tiny kit from Jaycar or an eBay one, using line output from the SCHA as preamp. I want to power the SCHA and the power amp using one toroid, how complicated would it be to modify what I've got now to accomodate this?
Reason for this is I'd like to install speaker outputs on my amp in anticipation of a cheap and cheerful Stax electret rig I've got en route. And having it on the same enclosure as my SCHA would be terrific.
If what I'm envisioning isn't possible or you guys think it's not worth it (dunno if those small kits are any good) then I wouldn't mind building a completely separate power amp in a matching enlosure and so in that case any kit suggestions would also be great!
marzukia Do you have any information on the drive requirements of the Stax Electrets ? I presume they are to be driven by an SRD4 transformer , or similar. I doubt that what you are suggesting is feasible. SandyK
Hi Alex! It's the SR-84 which I believe is the SR-80 with SRD-4 adapter. I've been hunting around the net for a manual or something for this model but haven't really been able to find what I'm looking for. I've read that some people run this particular rig from a T-amp -> adapter unit, which is why I thought I might be able to DIY something?
marzukia At one stage I used a pair of Stax and transformer driven by a 15W/Channel Class A amplifier with excellent results. You need a reasonable amount of power for the transformer to step up the signal voltage for the high voltage bias. Electret types have different requirements which I am not familiar with. You should be able to obtain further information from either asking in , or searching in Head Fi. Alex
I'll do that; still plenty of time before it gets here anyways. And I'll try running it from whatever I've got around the house as well.
EDIT: If what I'm reading is correct, it seems that the electrets don't need any bias voltage? And the adapter can be driven from a power/integrated amp or receiver speaker outputs.
marzukia The bias function part of the transformer (if fitted) would not be needed, however you still need to step up the output voltage via the transformer to a much higher driving voltage. That is why some kind of power amplifier is required.