[mordy]

Well I can tell you my GEC B36 sounds different from my Haltron ECC33.

My single GEC B36 in original GEC box came from Stavros and it was brand new unused when I had it. The Haltron ECC33 was also brand new won at an auction from an Aussie seller sometime. I cannot verify if a B36 and B65 sound the same because I don't have a B65. Leftside can but I doubt he wants to use his pair of brand new GEC B65.

Look at this Osram B65 - oozes class. Box is as new condition and rare
https://www.ebay.com/itm/B65-OSRAM-...340867?hash=item3d95822ac3:g:YCMAAOSwADVdp-Fk

Hi UT,
The Osram B65 is marked 20 Shilling AU (?). Out of curiosity, what would this 1951 price correspond to in $USD today? I am not able to find this out....

 

[JazzVinyl]

So, in conclusion the metal base likely sound very similar to the gray glass ST shaped since the internal construction is nearly the same, but cannot confirm absolutely.

So, what did you think of the NU 12J5's, LG?

 

[Zachik]

Here is a current listing for the metal base, get out your wallet!
https://www.ebay.com/itm/One-pair-N...61f07f4b5:g:HVkAAOSwmpJc~yAg&autorefresh=true

Only $40 / month for 12 months...

 

[Zachik]

Call and leave a voice mail, Stan will call you back.

He told me the metal 6J5 were mixed brands. The RCA 12J5 he has were 'new in orig box' and branded "Western Electronics" $4.00 ea, same as seen here:

https://www.ebay.com/itm/NOS-12J5GT...-Audio-Radio-Tubes-4-PC-8-OFFERS/333112580100

Thanks! Will do.

 

[gibosi]

Correct me if I’m wrong but there’s a difference right or are they the same? The B65 is different in sound compared to the ECC32/33? To correct myself as well I meant Osram instead of MOV.

Here’s the listing for the tubes. Love the way the way they look.

Whether labeled Osram, Marconi or GEC, they were all manufactured in the Hammersmith factory (Z). And MOV = Marconi-Osram Valve Company.

The B65 was manufactured in Hammersmith. The ECC32/33 were manufactered by Mullard, the earliest ones in their Blackburn factory.

So yes the B65 and ECC32/33 definitely sound different: Different companies, different factories, different sound.

 

[whirlwind]

I tried to buy a quad of the L63 Metal Base MOVs and those puppies went for $500+. I just didn’t have it in me to keep bidding. The singles I’ve see go for $250 - $300 easily. :’(

That is way to much....just look for a B36 metal base......12 volt version of B65

But if you feel you have to have L63...then
https://www.ebay.com/itm/L63-Osram-...e=STRK:MEBIDX:IT&_trksid=p2060353.m1438.l2649

 

[L0rdGwyn]

So, what did you think of the NU 12J5's, LG?

I need more time, JV! Listening now kept getting interrupted earlier, but early impressions are very good.

 

[L0rdGwyn]

BTW, just came across this - Yamamoto makes a UX4-B4 combination socket

That's right, you could use 5V UX4 rectifiers, then attach some series resistors to drop the voltage to 4V and use European rectifiers IN THE SAME SOCKET.

This changes everything, more research needs to be done...

 

[whirlwind]

BTW, just came across this - Yamamoto makes a UX4-B4 combination socket

That's right, you could use 5V UX4 rectifiers, then attach some series resistors to drop the voltage to 4V and use European rectifiers IN THE SAME SOCKET.

This changes everything, more research needs to be done...

Very nice....good stuff.

I am going to get all yamamoto sockets in my amp

 

[attmci]

Whether labeled Osram, Marconi or GEC, they were all manufactured in the Hammersmith factory (Z). And MOV = Marconi-Osram Valve Company.

The B65 was manufactured in Hammersmith. The ECC32/33 were manufactered by Mullard, the earliest ones in their Blackburn factory.

So yes the B65 and ECC32/33 definitely sound different: Different companies, different factories, different sound.

Different prices?

 

[leftside]

I have the Osram metal base L63 - but most certainly didn't pay the current prices you see on eBay. That quad from messinacat were way over-priced - especially if you check out the test results of the tubes. Dodgy seller imo, so you dodged a bullet if you didn't get them.

I haven't been able to try the Osram metal base L63 because with the WA22 I need 4 of them. I will be able to try with The Saint though, and also my custom OTL amp when I receive them, and then I can do a comparison of all the above mentioned by the good lord. The MWT straight glass with black base are really nice. I think they swapped from inverted tray getter to D getter sometime around 1956, but I'd have to check.

Did I mention this guy was dodgy? 1945? "Oh sorry - typo when I created the listing"
http://vpiforum.com/viewtopic.php?f=12&t=9534&hilit=dual+pivot

 

[leftside]

I'll also be able to compare B65 vs B36. One of the main reasons I became interested in the 12v switch was purely to be able to use the B36.

I also want to retry all the different ECC32 versions, foil, inverted tray, D getter, etc, but haven't noticed too much difference in the WA22. Same with ECC33 and ECC35.

 

[Monsterzero]

I'll also be able to compare B65 vs B36. One of the main reasons I became interested in the 12v switch was purely to be able to use the B36.

I also want to retry all the different ECC32 versions, foil, inverted tray, D getter, etc, but haven't noticed too much difference in the WA22.

Im looking forward to your thoughts on this comparison.

 

[leftside]

Whether labeled Osram, Marconi or GEC, they were all manufactured in the Hammersmith factory (Z). And MOV = Marconi-Osram Valve Company.

The B65 was manufactured in Hammersmith. The ECC32/33 were manufactered by Mullard, the earliest ones in their Blackburn factory.

So yes the B65 and ECC32/33 definitely sound different: Different companies, different factories, different sound.

A friend of mine who is almost as knowledgeable as you regarding tubes says that the early Mullard and early GEC tubes obtained the coveted black plates from the same source, and this is what makes the early Mullards (pre 1956ish) so desirable. He also says the early Mullards sound similar to the GEC tubes because of this, and the latter ones have more of the traditional "warmer Mullard sound", but I can't find any links to verify this information.

 

[gibosi]

I'll also be able to compare B65 vs B36. One of the main reasons I became interested in the 12v switch was purely to be able to use the B36.

I also want to retry all the different ECC32 versions, foil, inverted tray, D getter, etc, but haven't noticed too much difference in the WA22. Same with ECC33 and ECC35.

Regarding the B65 vs B36, if the only difference is the heater voltage, they will certainly sound the same. But if they were manufactured at different times with different construction then they may sound different.