Tubes for BAT VK60. Need help

Jim,

I'm a little late to the party, but in the future, you may want to consider ATSI for a matched & tested set of 6C33C-Bs. I bought my last quad there and have had really good luck (they have increased in price, though.) I believe he's the only game in town if you want matched tubes AND a 90 day guarantee.

I'll also second Andy at VTS. He's very knowledgable about the VK60 and which tube will get you what you are looking for.

I'll 2nd ATSI. I've bought 2 sets of 6C33b's from ATSI. Have initial failures both times, and got a prompt replacement. Great service.

THANKS FOLKS. nOT TOO LATE i DON'T THINK ACTUALLY. tHE JOINT i USED IS IN cANADA. tHEIR TESTING EQUIPMENT IS NOT DUE IN TILL NEXT WEEK SOMETIME.

They say they'll match them.

Kevin Deals joint shows 6c33 tubes available. Not 6c33c-b.

Anyone ever have issues with these VK60s blowing fuses? or blowing them as the result of which preamp is tied to it?
Especially a Thor?

Thanks people... I might get this right in spite of myself with your help.

Which fuse? The fuse on the back panel next to the power cord or one of the 4 fuses underneath the tubes? If underneath the tubes...it's likely tubes arcing and failing. That is common. New tubes and a new fuse from Radioshack. Make sure it's the same type and value.

I'm pretty sure Kevin Deals 63CC tubes are really 6C33cb's. I've retubed my VK60 from him once. Tubes sounded great.

If it's the main fuse. That maybe a issue somewhere, I can't comment there...

john

Good John, many thanks.

RE - K. Deals' 6c33'S
I was hoping that to be the case. Though I did see a .pdf Tube Data sheet that showed both it and the 33c-b as two different tubes. Looking at the pics of both hasn't helped. They spec differently too.

RE - fuses
"Underneath"

...according to the owner which had that experience (s). his thoughts pointed more to the application and use to the Thor pre IN CONJUNCTION WITH, rather than the BAT VK60'S '6SN7S' alone. Some reverse synergy I guess.

We are soon to find out for sure.

BAT's tech guy, 'Dan', said to that account, "the SN's need have the 600v rating to avoid that and usually it is a bad tube causing it, arced, or to low a voltage value most of the time."

As best I can remember, Dan also mentioned rolling tubes in the amp isn't a bad thing, but one runs the risk of blowing fuses and/or tubes, if the plate voltages aren't in keeping with the design parameters... saying some NOS tubes just weren't on that level years ago.

Andy of VTS said the safe bet given that info is to keep to the military grade of NOS 6sn7's.... 5761? Syl, Tung, or RCA.

have you or anyone found placing the speaker being used cables onto taps other than the speakers suggested imp load, effective, better, or no diff? (like putting a 8 ohm spkr onto the 4 ohm taps, for ex.)