audio-talk

confessions... since i got back from owston i've only used the tda 7297 based amp in my listening room, i got hold of some ex led power supplys which run at around 13 vt/ 3a which were to be scrapped, they sound very good, although not quite a px 25.. the power supplies are basic 4 diodes with caps ...

Nick we are all gullty of hearing what we want to hear at times and disregarding the rest, i consider it a skill... the regulated supply in your 45 could sound better because the valve sounds better on a regulated supply, or it could be the lack modulated section of the supply ensuring a clean power...

I think there are two issues i can think of and it will depend on the amp or valves used. 1st the modern production 300 b valves i 've heard seem to benefit from a regulated supply to tighten the bass, thats not really an issue with the old valves ..in my view. The 2nd is the power supply is modulat...

Makes the 11 i've got wired up look like i'm being a cheapskate....but its only 2 stages.. Nice to know i'm going in the right direction... At last eh.. Whats holding me back at this point is the fact that i may be better off with 4 separate power supplies, i've been doing a lot of searching and thi...

Nick wrote:IMHO,

it showed me the decoupling cap in the power supply doesn't do what you are told it does

It does exactly what we are told it does, but we often misunderstand what we are told.

Thats a fair point Nick...

So many options open to me, thanks everyone for the seed-thoughts, s'preciated. As appealing as an off-the-shelf-reg-kit is I'm tempted to have a bash at DIY-ing a solution 1st. If it doesn't work out I can always take one of the other routes. I'll rub my hairy chin and report back. DTB I've been d...

Not quite the answer to the question you is asking .... I'd stay away from regs. Rather use separate supplies for outputs and driver. LC for finals, LCLC for driver. Well summit like that. Mayhaps LCLC for finals. A reg is just another amplifier with its own signature so the supply is tainted with ...

These are my smaller H frames they run from a set amp in a 25x18 ish room the bass output is good down to the 40,s A few years i used the same bass mid drivers with ex4 and before that with vitavox horns and fostex T900. The lowther were used off axis, they worked well but the beymas are much cleane...

I have a few used mo bases if you need them Steve.. now the ef 50 romance has finished

Let me know ill get some in the post

Ef 37a would be a good choice too, they say the quad 1sounded much better than the quad 2... Ef37a vs ef86....

I may have some locking sockets, but finding an exact pair may be a challenge i also have a bucket load of ef50's, i had a sort through the other night checking for some high gm valves of similar age and type, found none but there must 20 ef50's, they look the part with the ali cut off.

£58.28 is the best I've found so far. Yeah, i don't think prices vary all that much. That sounds reasonable, but you sometimes get secondhand ones cropping up on Epay. Thinking about it, i paid over £50 four years ago. I think i paid £48 in the nineties.. Was going to build a lowther horn with a 15...

Thanks for that link Nicoch ; the links at the bottom of that page were very useful - just working my way through them now . Steve - I agree that bracing & stiffness are important. I still remember how badly the tone and impulse response of an FE167E were affected when it was mounted into a lar...

Open baffles, this is far from your original plans mark. I've found the two main issues are panel resonance and standing waves. As you know mark i prefer H frame OB but i know they need to be extremely well damped internally, My speakers at our last Owston event, highlighted the effect of what a lac...

Many of the old vavles will do this, you must be carefull to ensure none of the wires inside touch when you re stick it, check all the pins with meter for shorts after. You should just get a circuit across the heater Run nail varnish remover round the bass with a fine artists paint brush you will fe...