Standard PPAv2 with STEPS, Class A OPA627s at 2mA. I put a lot of work into the casing, The front panel is from FPE and was well worth the effort. Just listening to the amp right now.

Perfect. Thank you NeilR.

I was thinking more about the behaviour when turning OFF.

Is there any benefit in using a DPDT switch to 1) switch the live wire on the STEPS input and simultaneously 2) switch the output from the STEPS to the PPA ?

Forgot to add. I'd appreciate any comments anyone can offer.

I have just completed my PPAv2 and STEPS boards and am getting around to the casing. I have an expensive filtered IEC inlet socket lying around and was planning on using this to feed the STEPS. Is this overkill or just plain unwise since I understand the STEPS features filters also? If it...

Many thanks everyone. I have just ordered this 2N5088_D81Z, Mouser part no: 512-2N5088D81Z. Hopefully it will do the job!

I have had an order with Mouser on hold now for 2 weeks all because of one lousy part. I've had enough of waiting and want to find an available replacement part for Q31-33, buffer driver transistor 2N5088 (Mouser ID: 512-2N5088_J61Z). I would preferably like a part equal or better in...

Thank you for your help stienchen. I'll be using the OPA627/637 combo. I'm thinking that the +/- 12V is probably the safer option since I've already ordered the ELNa 470uF 25V caps for the PPA v2. That should give me up to 24V which I'm hoping is plenty for the 627/637s.

Is this a suitable part from RS? Part No: 173-6019 I'd rather get all the parts from one place. Also I'm unsure about whether to get +/-12V or a +/-15V transformer. I'm going to use it with a PPAv2 which should only take about 22V right? Many thanks

Oh and thank you in advance

lol. 4.7K sure woulda been interesting. Another question.... I'm intending on using a metal case fot the PP2 and steps. I understand that I need an isolated output jack but how about input RCAs? Do these need to be isolated also or is using the all-metal non-insulated variety OK?

is 4.7K 2W an acceptable alternative??? Mouser are all out of the 2.2K ones.

Hi everyone, Its been about 4 years since I've last posted on this forum and its great to catch up with the posts and the latest happening in the DIY community. Right, bite the bullet time. I've just recently purchased a pair of HD650s and want to build a new amp especially for them. I...

Interesting post there jeffrey. I'll get working through those suggestions - I have a feeling its going to be very hit and miss but oh well! Never realised it would be so hard to rid of magnetic flux leakage Thanks again

Maybe I didnt make it obvious enough, my fault, let me explain again. Typically the PS and the amp, which are in seperate enclosures, sit side by side. The PS connects to the amp via a 2-core wire to supply the juice. Side by side I have absolutely no problems with noise of any kind. NONE...

After having completed a Regulated LM317 PS based on a torroidial tranny, I've discovered that the tranny is emitting noise that can be picked up on my amp. Although the amp and the PS are in seperate enclusures, I stack them one on top of the other to save space. The noise is certainly from the...

one question - having just built a regulated lm317 PS, how do i go about measuring its output current? This is prob a real dumb question but i couldnt figure where to place my meter probes to do this.

Cheapest price I have found is from www.gear4music.com - £96 inc. recorded delivery and VAT. Not bad huh. Will buy these shortly.

thanks for your help voodoo. just gave my new PS a workout - very nice indeed! Nearly **** myself when the thing wouldnt go above approx 3V - turned out that the output electrolytic was the wrong way around! Jeez. But now that its sorted its working a treat. I left a 5K POT in place of R2 so...

cheers for the suggestion but its a great deal more work and involves dreaded demolition of my existing amp. i'll remember this for my 'retirement amp' though, although its certainly a good few yrs off!

hopefully that last post makes sense. But from the looks of it I'm in the same boat as guzzler and his META. He already has a voltage splitter on board the META PCB so only needed a single supply. But I'd be keen to know the benefits of a fully blown dual regulated supply, voodoo?

good point voodoo. a dual supply certainly would rid the bug to upgrade again! the only thing is i've had my amp built for over a year now and have been using a crappy wall regulated DC supply. I'm using a BUF634 splitter (preceded by resistor divider) within the amp enclosure itself to split...

Makes a great deal of sense. What's so magic about 12 anyways! I'll check the spec for the amps and do the rest. otherwise, i'll try to find a lower current rated tranny. see what u mean about overkill lol cheers guys

Ahh beginning to make sense. 2x12V will give +33 and just use 317 to regulate it to 24V. Nine volts to rid of, so a heatsink looks likely. am using opa637s together with el2001s. so +/- 12V should be just fine