What tubes are you using with your BA?

It will be good to have this tube rolling thread especially when the new set of px4 amps arrive.

I can't wait for the day when you have sorted out the adapter and resistor problem so we can use the old style PX4s.
Can you imagine the possibilities?

It shoudnt need a resistor. The old stock and the new ones are identical except the base. Just need to find an adapter or a way to make one.

I think I found something. Its not an adapter. It is a new socket that accepts b4 tubes and ux4 tubes. You would just have to have Craig install this in your ba. I am going to send him an email.
http://www.jacmusic.com/sockets/Socket-Yamamoto.htm

KingStyles are these the ones:
 
Teflon UX4-B4 Socket:320-024-88
 
So we could use vintage PX4 tubes with a 4V biasing voltage without any need for a different resistor?
 
Or the different biasing resistors will have to be connected as per Jacmusic's recommendation?
 
 

No resistor needed since our ba already has a switchable resistor. The switch in back toggles the resistor. Craig emailed me about my inquiry,
 
Quote:

Yes that is a genius product, very cool. If I had known about that I would have made the metal for that socket. The Yamamoto has a different mounting ring, and mounting hole spacing. The socket has to be machined to fit the BA, or a new top plate has to be made.

Click to expand...

So it doesnt look like we would be able to get that but I wouldnt be surprised to see the next batch after ours have it. Oh well, I will keep looking for an adapter.

I got a similar message from Craig a couple of hours ago when I sent him the info you found.
 
Back to square one, but think of all the wonderful PX25s???? or vintage PX4s we could use.
 
Great product KingStyles well done keep looking for the adapter.

Tried the Sophia Electric PX4's and Tesla JJ300B's.
 
Still burning in the amp and tubes, but initial impressions are the JJ300B have better low end and the Sophia better midrange.
 
These are very first impressions and may change as the tubes and amp burn in.

Trying the BA with EAT 300Bs, TSBGRP and Grado SR325is. 
So far smooth low end, great mids, tamed high end, nice detail, separation and instrument placement.
Any KR PX4 users?

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rosgr63 said:

Trying the BA with EAT 300Bs, TSBGRP and Grado SR325is. 
So far smooth low end, great mids, tamed high end, nice detail, separation and instrument placement.
Any KR PX4 users?

Click to expand...

I have the KR PX4 but I have nothing to compare them too. I wanted to find a nice set of Western Electric NOS 300b,, until I found out. "A nice matched set were going for $3500.00".  E bay has also invented a new category slightly USED NOS..LOL.
 
Even the reissue WE 300b are over $1500.00 which is not out of my budget but are they really made the same way? with the same material? and the same equipment? And do they sound the same?  And are the ones I keep seeing on e bay with NO serial # "out-cast" .. ???
 
My favorite driver so far is the Tung Sol 6SN7GT round plate...does everything just a bit better than the Sylvania 6SN7GTB chrome top, green lettering (it reminds me of the HD 800 just a little sterile sounding)...I was told the Silvertone was a nice sleeper tube ($20.00) so I snagged one off e bay,,it Looks exactly like the Sylvan 6SN7GTB chrome top..(looks like a re brand to me,,)  it sounds the same to me.  I had a few others that I let go with my WA22 that I thought were good but the TSRP,,were the best in my rig..So far Meridian 808.2i black Dragon interconnects you know whats goes here and LCD 2 with stock cable and a Blue Dragon balanced. I am looking into a Brimer 6SN7GTY..

If you are looking for Brimar 6SN7GTY ( CV1988 ), get the one with the black coated glass. It sounds better to me than the clear glass version.
 

The clear glass Brimar 6SN7GTY clear glass come in two flavors, long and short plates.
When I am done with the EATs I will try my KR PX4s with the 3 different Brimar GTYs. 

Hey guys I am going to try and find out the answer,,Google is our friend but anyone know if this a Brimar tube?http://cgi.ebay.com/2Pcs-NOS-CV1988-6SN7GTY-ECC32-5692-6SN7GT-Brown-Base-/300477389198?pt=Vintage_Electronics_R2&hash=item45f5d9198e#ht_500wt_1156

I believe they are from the Standard Telephone Company.