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Post subject: Re: Tubes and more tubes Sweet jackpot !
Posted: Sun Apr 15, 2012 9:36 am
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when i get done researching all the #'s I'll sell off the kit and its contents

This is my third such find, the first one was well over 1000 tubes a few years back.

I sold some stuff I wish i had back today !!!!

Not being independently wealthy, I can't keep all the good stuff, gotta eat too.

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Post subject: Re: Tubes and more tubes Sweet jackpot !
Posted: Sun Apr 15, 2012 2:40 pm
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blues bondsman wrote:
I sold some stuff I wish i had back today !!!!


From your lips to God's ear.

In that regard, we're all "guilty as charged"!

:mrgreen:

Arjay

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Post subject: Re: Tubes and more tubes Sweet jackpot !
Posted: Sun Apr 15, 2012 3:16 pm
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aclempoppi wrote:
Don't know why you couldn't use the 5U4GB. As for the 5881's, those tubes were center rated, not max rated. Most data sheets refer to that center rating, which would give them a long life under those conditions. I've used NOS Tungsol 5881's in my Bassman(475vdc plate) for many hours of solid operation. If those tubes are pulls, then their strength is another story. Art


Was that measured voltage? The reason I ask is that I've seen warnings that wall voltage these days could be 5 - 10V higher than back in the '50s and '60s. (110V vs 120V today) This supposedly could result in corresponding increase on calculated voltages on old tube circuits.

Could be another myth.

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Post subject: Re: Tubes and more tubes Sweet jackpot !
Posted: Sun Apr 15, 2012 5:02 pm
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mhowell wrote:
aclempoppi wrote:
Don't know why you couldn't use the 5U4GB. As for the 5881's, those tubes were center rated, not max rated. Most data sheets refer to that center rating, which would give them a long life under those conditions. I've used NOS Tungsol 5881's in my Bassman(475vdc plate) for many hours of solid operation. If those tubes are pulls, then their strength is another story. Art


Was that measured voltage? The reason I ask is that I've seen warnings that wall voltage these days could be 5 - 10V higher than back in the '50s and '60s. (110V vs 120V today) This supposedly could result in corresponding increase on calculated voltages on old tube circuits.

Could be another myth.


No myth.

Input voltages at the wall socket are running significantly higher now than in the '50s and '60s, as much as 127VAC in some areas. This results in a corresponding increase at most of the secondary taps in a power tranny, including those for the idle-bias supply.

Arjay

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Post subject: Re: Tubes and more tubes Sweet jackpot !
Posted: Sun Apr 15, 2012 7:28 pm
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Are there any 807's in there? Or any other kind of transmitting tubes?

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Post subject: Re: Tubes and more tubes Sweet jackpot !
Posted: Sun Apr 15, 2012 7:52 pm
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send a pm if you want to talk about whats in the box :mrgreen:

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Post subject: Re: Tubes and more tubes Sweet jackpot !
Posted: Sun Apr 15, 2012 8:06 pm
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Retroverbial wrote:
mhowell wrote:
aclempoppi wrote:
Don't know why you couldn't use the 5U4GB. As for the 5881's, those tubes were center rated, not max rated. Most data sheets refer to that center rating, which would give them a long life under those conditions. I've used NOS Tungsol 5881's in my Bassman(475vdc plate) for many hours of solid operation. If those tubes are pulls, then their strength is another story. Art


Was that measured voltage? The reason I ask is that I've seen warnings that wall voltage these days could be 5 - 10V higher than back in the '50s and '60s. (110V vs 120V today) This supposedly could result in corresponding increase on calculated voltages on old tube circuits.

Could be another myth.


No myth.

Input voltages at the wall socket are running significantly higher now than in the '50s and '60s, as much as 127VAC in some areas. This results in a corresponding increase at most of the secondary taps in a power tranny, including those for the idle-bias supply.

Arjay

No myth really...you see on the old Blackface and Brownface tube charts that the power supply mentioned is 117 vac.....my line voltage usually stays around 125 vac,I have a box that decreases the line voltage 6 to 12 volts,you can hear some difference when it's decreased,but I don't worry so much about it when I gig,I and some others around here have figured that these amps can handle it so far.
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Post subject: Re: Tubes and more tubes Sweet jackpot !
Posted: Mon Apr 16, 2012 4:06 am
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Hey folks, I'm not saying all 5881's are up to the task! Tubes are not uniform, even within brands and date iteration. Their construction is too random. Some 6L6's can't take the higher plate voltages(ie; GE 6L6GC-'50's iteration). If there is a concern, don't mess around. Have the NOS tubes tested prior to any long term dependence. We haven't really discussed the bias current for the old tubes. As far as I know, the older tubes aren't built to be run at that the 70% dissapation figure. Willing to hear the 70% view. JMO Art

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Post subject: Re: Tubes and more tubes Sweet jackpot !
Posted: Mon Apr 16, 2012 6:18 am
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Art,
I would be interested in hearing a little more about the limits/limitations of the original Tung-Sol 5881...I have used them in my '62 Vibrolux,(chart shown above)...I can't remember the voltage readings but I'll check my notes...I pulled them to save for something else but love the sound.
BTW the Vibrolux is a fixed bias amp,no adjustment pot.


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Post subject: Re: Tubes and more tubes Sweet jackpot !
Posted: Mon Apr 16, 2012 6:39 pm
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Reb, I'm not a tube guru! Beemer probably has better info. The tube data sheets, for the Tung Sol 5881 is in: Aspen Pittman's "The Tube Amp Book". I've done my share of reading and go onto more technical forums, for the on-going education. Also, talking with guys like Gregg Levy informs my opinion. Your 6G looks perfect for 5881's. JMHO Art

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Post subject: Re: Tubes and more tubes Sweet jackpot !
Posted: Tue Apr 17, 2012 6:06 am
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Thanks Art,
I buy tubes from Gregg Levy too at times,everytime I call we have a "lesson" on tubes for my amps...the guy is cool and knows his stuff.
Like you,I do lots of reading and have Pittman's book also....I spend lots of cash hunting down NOS or good testing tubes also....it's a costly endeavor,but to my ears the new production don't sound as good,they will do...some of them,but not all.
For new 6L6GCs I've settled for the Winged C's,now they're not made the same. :roll:


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