LS2 valve rolling

This morning i managed to find a little time to fit a new valve to my ls2 - working from home you see.

it is a fantastic improvement over the old valve, which may have been a little over the hill. everything is bigger, more musical, sweeter it's a hell of an upgrade for little more than a tenner. the valve itself is a russian 6N1P. even better, i have a spare one

 

i won't bother next time

 

John,

Nice one!

What was the old valve, a Sovtek or something?

I've just lobbed a couple of Siemens CCa in my amps in replacement of some Amperex Orange globe 6922. It's like having a different amp, more detail, focus etc. Although they did cost a bit more than a tenner , I consider them a very worthwhile improvement costwise. And I thought the Orange globes were quite an improvement!

Jeff

 

The old valve was a sovtek.
new valve is was bargain. do siemens still make these valves? - i guess not.

 

I'm playing with mine at the moment, I'm hoping to have a few samples soon to try out. I like the idea of being able to roll valves and tinker now, scared me witless when I first bought the amp.

 

John,

I think the CCa date back to the 60's or thereabouts. I'm not sure when Siemens stopped making valves.

Must admit I didn't know the 6N1P was a 6922 equivalent but then I've recently tried a 6CG7 which was fine too so what the hell.

Glad it worked out for you, wonder if 6N1P would work in my DAC (if my DAC works still, of course)


Richard,
Which type are you looking at?

Jeff

 

I've got lined up, some NOS GEC and Mullards 12AX7's, to try from a friend maybe.
Some NOS Mazda Cryogenic 12AX7's as well, maybe some Philips too.
Then for the 12AU7's I've got some NOS Brimars coming. I'll try them all and let you know how I get on. For the record the current AX7's are Ei and the AU7's are I guess new production Mullards, I wouldn't have thought they'd be NOS

 

Where are y'all getting your valves from?

Dunc

 

The Mullards and GEC's via a friend, they're just to try, they're very expensive indeed. The Philips I've been offered at a very fair price so if they don't work I'll offer them to someone else at the same price. The Mazda is coming from here:
http://www.watfordvalves.com/product_detail.asp?id=1429
The Brimar from here:
http://www.tube-shop.com/uk/prod_nos_detail.asp?ProductID=229&ProcessType=17
I've got the Mullard reissue and Ei in the amp already, they came with it.

 

jeff

I don't know the origin of the 6n1p, i gather it has a russian military origin. i suppose most do. It has 'OTK1' written down one side and what i think is a YOM of july 84 down another. I bought it one ebay.

From a quick web search i gather it is electrically slightly different from the 6922 althought the fixings are the same. fortunalty i found this out after i'd installed and had it working. otherwise i would have standing there with fire extinguisher at the ready.

it seems to work so as you say - what the hell. by the way when we do manage to meet you're welcome to try my spare 6n1p.

 

John,

Whenever's convenient really, I'm fairly free most eves except Weds/ Fris. I could bring along a couple of my Amperex 6922/6dj8 and probably a CCa.

Throw some dates at me and I'll let you know.

Jeff

 

Ebay / Audiogon.

Jeff

 

Hi,

The 6N1P is not a direct equivalent for the 6922/ECC88 valve. It is a valve that has some ssimilar parameters. This means it can work well in some amps and not others.

Here's a table of comparison of the valve.

http://www.fust-electronica.nl/ti6n1p_en.htm

One of the main things to watch out for is the heater current. It draws twice as much! But in some circuits it can out perform the usual big hitters.

SCIDB

 

Hi,

Here's a site that gives some thoughts on the different 6922/ECC88/6DJ8 valves.

http://www.audiotubes.com/6dj8.htm

SCIDB

 

On reflection, IIRC Metronome changed from using a 6922 in their cd-2V to a 6n1P and it was emphasised that the 6922 and 6n1P were not supposed to be interchangeable in the player. But that was a CD player circuit rather than a pre. They must have thought it was a better sounding valve for their purpose though I suppose.

So as it seems to work - inspired choice of valve John

Jeff

 

more by luck than judgement. i read about the heater current as well. as i said i'd changed it by then

 

PM me and we'llget something sorted

Jeff

 

Audio Research LS2

Hi, I have an Audio Research LS2 which suffers from the "usual" problem of too much gain. I aslo use a V70 power amp and CD3 player. What is the ultimate valve replacement for the LS2 and will it reduce the gain?

 

Too much gain in LS2

 

Use some in-line attenuators. I use Goldenjacks - I think they are excellent and quite transparent (much better than the more expensive Rothwells I've also tried which were woolly sounding).

http://cgi.ebay.co.uk/GOLDENJACKS-L...oryZ3272QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

They'll not only reduce the gain if placed in the power amp input sockets, but will reduce any pre-amp noise too!