Tube rolling the Baby Black Beauty or CF amps

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MRHP
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Re: Tube rolling the Baby Black Beauty or CF amps

Post by MRHP » Thu Sep 26, 2013 8:23 am

When setup in mono block config, some amps leave one of the two 12ax7's at idle. Can someone give me an idea how to test and see if the Baby Black's are like this....without blowing up anything!!!LOL

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Re: Tube rolling the Baby Black Beauty or CF amps

Post by TNRabbit » Thu Sep 26, 2013 11:16 am

They would almost certainly have to be the same way; you only have input on one side, so the other tube would be unused. If you're worried about even wear, switch inputs occasionally~

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Re: Tube rolling the Baby Black Beauty or CF amps

Post by mbskeam » Thu Sep 26, 2013 3:02 pm

Ummmm.
this amp uses both small tubes.
the toggle acts the same as a Wye cable
what you end up with is both sets of el84 tubes working as 4 instead of 2....

a quick test, pull one of the small tubes when in mono.

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Re: Tube rolling the Baby Black Beauty or CF amps

Post by TNRabbit » Thu Sep 26, 2013 5:12 pm

Mike, do the Baby Black Beauties have a toggle? Not all the CF amps do....in fact, I'd wager that most don't.

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Re: Tube rolling the Baby Black Beauty or CF amps

Post by mbskeam » Thu Sep 26, 2013 7:16 pm

yes the real production amps have a toggle switch as to the cf amps I dont have a clue who has done this or not, wye cables are much simpler....

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Re: Tube rolling the Baby Black Beauty or CF amps

Post by MRHP » Fri Sep 27, 2013 8:00 am

mbskeam wrote:Ummmm.
this amp uses both small tubes.
the toggle acts the same as a Wye cable
what you end up with is both sets of el84 tubes working as 4 instead of 2....

a quick test, pull one of the small tubes when in mono.
just pull it out with the amp running?

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Re: Tube rolling the Baby Black Beauty or CF amps

Post by mbskeam » Fri Sep 27, 2013 2:34 pm

no, turn it off, pull 12ax7 tube, then on.

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Re: Tube rolling the Baby Black Beauty or CF amps

Post by Magnaryder » Wed Nov 27, 2013 10:17 pm

mbskeam wrote:yes the real production amps have a toggle switch as to the cf amps I dont have a clue who has done this or not, wye cables are much simpler....
Mike, I included a bridging switch on my CF amps. I talked Angelo out of a couple of them. They work great and I'm not messing with Y cables. I had an issue with them before.

ray
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Re: Tube rolling the Baby Black Beauty or CF amps

Post by radioeng2 » Thu Nov 28, 2013 8:09 am

MRHP wrote:When setup in mono block config, some amps leave one of the two 12ax7's at idle. Can someone give me an idea how to test and see if the Baby Black's are like this....without blowing up anything!!!LOL
I might be wrong, but what I think you're referring to is that while these and most small signal tubes are two triodes, some designs only use one of the triodes in the tube envelope.

In these, that is not the case. One half is used as input voltage gain, the second half as the phase splitter for each channel. So two small signal tubes are being used for a stereo amp. When you're mono-blocking by driving both channels either through a Y cable or physically through a switch, you are still using both channels input sections, so nothing is hanging unused.

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Re: Tube rolling the Baby Black Beauty or CF amps

Post by MRHP » Fri Nov 29, 2013 9:43 am

radioeng2 wrote:
MRHP wrote:When setup in mono block config, some amps leave one of the two 12ax7's at idle. Can someone give me an idea how to test and see if the Baby Black's are like this....without blowing up anything!!!LOL
I might be wrong, but what I think you're referring to is that while these and most small signal tubes are two triodes, some designs only use one of the triodes in the tube envelope.

In these, that is not the case. One half is used as input voltage gain, the second half as the phase splitter for each channel. So two small signal tubes are being used for a stereo amp. When you're mono-blocking by driving both channels either through a Y cable or physically through a switch, you are still using both channels input sections, so nothing is hanging unused.

Mark
Thanks Mark, thats what I needed to know. :)
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Re: Tube rolling the Baby Black Beauty or CF amps

Post by Magnaryder » Fri Nov 29, 2013 9:30 pm

Mark, the pic you use for your avatar is way cool.

ray
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Re: Tube rolling the Baby Black Beauty or CF amps

Post by radioeng2 » Sun Dec 01, 2013 2:45 pm

Magnaryder wrote:Mark, the pic you use for your avatar is way cool.

ray
Thanks Ray. I use it as reminder that one little slip and any of us could have that view. As per Harry.
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Re: Tube rolling the Baby Black Beauty or CF amps

Post by hewlew1 » Sun Dec 01, 2013 3:00 pm

LMAO I am glad to see that remark did not slip by you.
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Re: Tube rolling the Baby Black Beauty or CF amps

Post by stevek » Mon Dec 02, 2013 6:04 am

FYI,
Cyber Monday sale at tube depot 6am-noon cst. No connection, never bought from them, I'm just a bargain hunter.
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Re: Tube rolling the Baby Black Beauty or CF amps

Post by radioeng2 » Mon Dec 02, 2013 8:13 am

Thanks for pointing this sale out Steve!

Tube Depot is in Memphis. I've ordered from them a couple times and they were flawless transactions. Prompt delivery as I recall. Haven't interacted with them other than web orders so can't comment beyond my experience. Seems to me to be a safe company to deal with.

http://www.tubedepot.com/

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