spritzer

The ESP950 cables were something around 10$. Haven't bought any in probably 10 years though...

You do have a point there and I know that this is a purely psychological phenomenon. It doesn't exist in the sense that we can't measure it, caps don't magically change after being charged/discharged a few million times (100 hour burn in). It is also a pure fallacy to think that a one 5 minute session with any component will give you an an accurate impression of its signature, our senses simply aren't that good. They also just make up shit and lie to us... those fuckers...

There is no such thing as run/burn-in

I've been putting them through their paces this morning and my only complaint is the slightly overblown bass. Plugging the port should fix that issue.

Koss ESP950 extension cable works just fine. Ask somebody in the US to order a few for you and drop in an envelope.

They don't ship internationally... at least they didn't. Ebay might have something like that.

Yup, and they sure can rock. Bass has that slight reverb to it which suits rock perfectly. I'll reserve final judgement until I've plugged the ports and played with the pads. This is a bloody good start though...

An hour or so ago I got a brand new SR-007Mk2 delivered to me serial SZ3-2029. First impressions are positive, the fit out of the box is good and the midrange issues I had with the older Mk2.5 are gone now. The bass is a joke as is to be expected from a ported design but it is at least mostly controlled and only falls apart at a limited range. The top end is not as smooth as it should be but it might just be due to the earpad position. More updates coming and we'll see how long I'll last until I've ripped them apart to mod.

More than half of my SumR transformers buzzed and about a quarter are simply unusable. One of them melted through the insulation and shorted to the chassis... I've had some up and downs with Toroidy but they are mostly good.

I just want some large film caps right on the rails.

I don't think there is anybody who will match these for you. The amp will work just fine with unmatched ones though

The transformers are over spec so line fluctuation should never be a problem.

Poly caps always beat ceramic in my book so go for it. As for the 4.7uf caps, I can't find the layput files here for this board but I'm pretty sure they are the bypass caps I wanted Kevin to put in. Any value that fits is fine there but moar is moar bettah!!!

Indeed!!!!

Should be ok at lower voltages.

Been there, done that. It's a waste of money in this circuit.

It can be wired as both 117V and 230V but why would you order a transformer like that. You need a switch to wire them either in series or parallel but no simple solution springs to mind. Nothing wrong with doing this but watch the phase. I had to do this on the KGDT's that I'm working on and used this transformer: 553-FS36-350 with these custom PCB's: It was the neatest way of doing it. I have some spare PCB's listed on my site if anybody needs one.

The 21K is to drop the +450V down to +300V to power the front end. There is no attenuation anywhere so either wrong parts somewhere or the tubes are bad.

Indeed, doesn't make any sense.

100V zeners back to back and 1N4007's is what I used.

It would be very Rudistor though. He had "silver reinforced" traces...

I think the only reason why my T2 arced through the bushing into the screw is because of the hole on the 3675's isn't quite large enough so I had to force them. Might have damaged one in the process.

Yup

It's fine to keep C108 but put it before R104.

I use M3 standoffs instead of nuts. Less chance of the thread stripping.