Quote: Originally Posted by the_equalizer /img/forum/go_quote.gif You're absolutely right, my apologies. Indeed it is R2 and R8 that need to be 390 Kohms. cheers! ...and...its all done it works perfectly too Koss Porta's sound amazing through them, so gonna sit down now and try my JH13's...ahhh I have some other jobs to do today but I will hopefully get around to posting some pictures later, its not too neat but hey whatever it works..in the words of vicki pollard..face..bovvered edit: wow..the 13's sound amazing with the SSMH! edit2: and here we go: sorry there is no picture of the tube sockets themselves, I didn't have a camera to hand when I screwed the bottom plate on. I did take one on my phone, whether it came out good or not I don't know but I will have a look at that later. Following equalizer's revised pin mapping worked just peachy though. As you can see, tidy wires isn't my strong point. I'm not fussed at all..it works perfectly and yea its an open box design but pfft whatever I'm still proud that the damn thing works!! some notes: - For the wiring I used the wire from a CAT6 ethernet cable, both strands of each colour making up one wire. It worked quite well and is nice and still but I think it contributed to the messyness and my fingers hurt from stripping it! haha - the PSU is not a Cisco PSA-18, it is a Cisco EADP-18FB, its from what I can tell exactly from pdf specs exactly the same apart from the label colour and unit shape. The Cisco ADP-18PB is also the same/similar and will work which will make it even easier to find one on ebay, the PSA-18 on ebay UK was about £12, the one I got £4. The EADP-18FB and ADP-18PB both use 2.5mm sockets - the tubes are not 12Ax7 tubes..they are Philips 5963 tubes which are part of the same ECC82 family..this is what Jac Music says: Quote: Special Quality ECC82. Different in two points: 1)Longer Stand by function 2) balanced tube by default. * With those two points you have basically the same properties as the Telefunken ECC802S see here for other compatible tubes with this build: http://www.jacmusic.com/nos/ECC82.htm they cost me £5.50 each from ebay, and they are NOS tubes..imo a bargain - I used 2.2k resistors instead of 2k..whether this makes a difference or not I don't know but rapid electronics didn't have any 2k in stock and it sounds good regardless. so how does it sound? awsome. I haven't listened to it fully and properly yet but I had about 15 minutes and I was amazed. I tested with PortaPro's and they sounded fantastic then I listened to my JH13's and I was blown away, the sound is so much richer, fuller and soundstage is more airy. As an example I have a dubstep track that has an extra drum beat that is usually hidden behind the bassline, the only time I've heard this extra beat is using the foobar virtual 5.1 thingy on my RX700's, never just playing it standard even with the 13's. With the SSMH its clear as a bell The 5963 tubes sound brilliant..can't compare them to any others since this is the first tubes I've ever listened to..but I will probably pick some others up, 12A's or generic ECC82's to compare I would like to publically thank equalizer for the advice given on this build, and everyone who contributes knowledge because this is a great project... now all it needs is for someone get working on a proper schematic for SSMH v2 (i.e 12AU7)..lets not let the SSMH die out through lack of 19J6 tubes!