audio-talk

Nick · Posted: Sat Feb 28, 2009 4:56 pm Post subject: 300b-5687

Finally got them finished. 300bXLS driven by two stages of 5687, first DC coupled to second, second choked loaded with Lundahl Anode choke. Driver stage running at 310v from a SS regulator based on one of Bronskys, power stage with series reg, 6080 series element, ecc83 control valve. B+ adjustable from 430 to 550 to allow mesh plates and KR300b to both be used. Ouput transformer from Partridge.

Andrew · Shed dweller Joined: 24 May 2007 Posts: 2228

And, how does it sound?

ed · Posted: Sat Feb 28, 2009 5:26 pm Post subject:

coo, please boss, where did you get the tranny covers???

SteveTheShadow · Posted: Sat Feb 28, 2009 6:19 pm Post subject:

Nice amp Nick.

Steve

Toppsy · Posted: Sat Feb 28, 2009 6:29 pm Post subject:

I was over at Nick's this afternoon and this amp is rather good indeed. It has a super sound with lots are air and ambiance and emotion I could happily live with this myself.

Shame about that ugly looking partridge TX but that's how the customer wants it I understand. Some people, no taste for aesthetics.
But then hey Nick putting a tranny cover over this affects the sound right Wink

Andrew · Shed dweller Joined: 24 May 2007 Posts: 2228

IslandPink · Posted: Sun Mar 01, 2009 11:24 am Post subject:

Those output transformers look really neat - much tidier than Dave Slagle's units Very Happy

Nick told me he was very pleased with the sound - a tough call between that and his 211 amp from what he said .

MJ

Nick · Posted: Sun Mar 01, 2009 7:51 pm Post subject:

We had a listen to them this aft, the 211 with NOS valves in is better than the 300b (IMHO), with Chinese 211's its not as good. Comparing to Simon's 45 driven 300b, its hard to say, I think I prefer the 45 driver, the 5687 is winder band though and I think has a bit more resolution in the lower freq ranges, so its a tough call.

Ed: The potting box is what AE use (its a AE mains TX under it), they may sell you them empty.

Max N · Old Hand Joined: 16 Aug 2007 Posts: 474

Hi Nick
Nice job Smile

So far, has all listening been with 300BXLS?
Do you plan to try it with the mesh plates? (TJs I presume?)

Nick · Posted: Sun Mar 15, 2009 10:28 pm Post subject:

I did try it with the TJ's, not that much difference in sound, but I didn't get long to compare. They have gone to their new home now.

Max N · Old Hand Joined: 16 Aug 2007 Posts: 474

OK, thanks.
I think TJ mesh are about the best 300B I've heard, although that was in push-pull. I've never had the chance to compare TJ with the KR300BXLS, but I know the KRs are also very good. So I was interested to hear how you thought the two compared. It does make sense that they sounded similar.

simon · Posted: Sun Mar 15, 2009 10:50 pm Post subject:

Max N · Old Hand Joined: 16 Aug 2007 Posts: 474

I've heard both tubes but in different amps at different times, never been able to compare them directly, and 'audio memory' is unreliable. But I thought they both sounded good, and my memory was that they both did the same things well (good extension of bass and treble, clean low distortion sound).
So my guess was just based on how I remember them each sounding, not on anything clever!

Max N · Old Hand Joined: 16 Aug 2007 Posts: 474

So Nick, how would you rate the Partridge transformers?
Do you know where they were sourced from?

Nick · Posted: Tue Mar 17, 2009 7:58 am Post subject: