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Post subject: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Thu May 12, 2011 9:58 am
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I've had some of the RI Tung-Sol 5881s in my '60 Super for a couple of months trying them out...but I wanted a NOS set of TS 5881,and at a pretty hefty price bought a pair from a guy in the business.....wow!! not much of a comparison.
I biased the new set,and after the first chord was strummed could tell a big difference...warmer,fuller,all of the good things about tube amp tone...it was there.
I'm not good at describing tone or sounds,I just know what sounds and feels right....these are the real deal,like so many other NOS tubes in my amps,I just love them and as long as they are available I'll use them...
I can live with Reissue tubes,but I love living with the NOS tubes. :D


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Thu May 12, 2011 10:23 am
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Rebelsoul wrote:
I can live with Reissue tubes,but I love living with the NOS tubes.


+1!

Old-school wins every time IMO.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Thu May 12, 2011 11:08 am
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Roadie
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RS....
A while back I was using a pair of orig 5881's in my 1965 Super Reverb. All good for about 10 hours then one blew and took out my 150.00 Mullard GZ34. Now I dont know if it was an unhealthy 5881 or if it just couldn't handle the plate voltage. I know they are rated for around 400 vdc max supposedly.
Anyway....heard the RI 5881 are able to handle upto 500vdc. Was told by someone at New Sensor. I have had them in there for at least 2 years now. I dont gig out but the amp but I use the amp a few times a week for usually a couple of hours each session.
Love the way the sound. Great for earlier sweet break up.
Great tubes in that application IMO..


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 6:13 am
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mxvin, are you sure your bias was right before you use, your 5881 ?

It looks too me that your bias was a very very hot or short in your output transformer or Speaker


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 6:49 am
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stratele52 wrote:
mxvin, are you sure your bias was right before you use, your 5881 ?

It looks too me that your bias was a very very hot or short in your output transformer or Speaker


I had the 5881 's biased correctly. OT and speakers are fine. Still using them today.
'I think the orig 5881 just couldn't handle the 460 VDC or one of the old tubes just was bad.


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 11:22 am
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I've got around 467 VDC on the original 5881's in my amp...we shall see.


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 11:30 am
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Rebelsoul wrote:
I've got around 467 VDC on the original 5881's in my amp...we shall see.

I think it was more a bad tube than anytihng else. They were orig and old. It took out the Mullard GZ34...thats what really po'd me. I must say though I am digging the RI TS 5881.
Very nice sounding tube....


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 11:33 am
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Awfully hot, Reb.

I wouldn't push an NOS 5881 beyond 430 VDC.

But hey, I'm a conservative. YMMV

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 11:40 am
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On RCA receiving tubes manual ( RC-26) they saisd, maximum operating voltage ; 400 v and typical operation characteristics ; 350 v.

That's good fot 6L6 GC but I won't use 5881 on more than 400v. If a tube fail it can damage other component as msvin see


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 12:19 pm
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stratele52 wrote:
On RCA receiving tubes manual ( RC-26) they saisd, maximum operating voltage ; 400 v and typical operation characteristics ; 350 v.

That's good fot 6L6 GC but I won't use 5881 on more than 400v. If a tube fail it can damage other component as msvin see


+1

Another thing not considered -- wall voltages back in the '50s and early '60s ran much closer to 110 VAC. I've recently measured wall sockets that read as high as 127 volts......a difference substantial enough to potentially damage a vintage amp's power tranny, rectifier, and -- in some instances -- the output stage.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 1:02 pm
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You are right retroverbial about wall voltage, that's why I NEVER trust voltage on shematics. I ALWAYS take my own mesurements. Good tech know to not trust any voltage on schematic.

mxvin did not tell us how much voltage he mesure on his amp, on his 5881 plate
____________________________________________________________________
In any forums my question are often :

When people talk about their voltage, where they get them ? On schematics or by mesurement . Bias , the same, many just said my bias is good ( this is not only for you mxvin ). Who are you to tell that ? To be sure what you are talking about ? I don't know you personnaly, your knowledge.
I'd like to help but is very important that the information you give is good because I don't like too loose my time and give you the wrong information because the voltage you write is not good


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 1:06 pm
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Might have to reconsider it,the guy I bought them from says they can handle it,check his site and what he says about them.I have dealt with Gregg in the past and have found him to be honest.
but the wall AC is around 125v,I've worried about that also.....with all my amps.
http://www.hitestguitars.com/

btw: we know what DRs and 6V6 tubes go through. :shock:


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 1:13 pm
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stratele52 wrote:
You are right retroverbial about wall voltage, that's why I NEVER trust voltage on shematics. I ALWAYS take my own mesurements. Good tech know to not trust any voltage on schematic.

mxvin did not tell us how much voltage he mesure on his amp, on his 5881 plate
____________________________________________________________________
In any forums my question are often :

When people talk about their voltage, where they get them ? On schematics or by mesurement . Bias , the same, many just said my bias is good ( this is not only for you mxvin ). Who are you to tell that ? To be sure what you are talking about ? I don't know you personnaly, your knowledge.
I'd like to help but is very important that the information you give is good because I don't like too loose my time and give you the wrong information because the voltage you write is not good


look up a few posts I did mention that my amp had about 460 vdc on the plates...
I dont remember what my exact bias was but I am familar with biasing with Fender AB type amps. I dont abuse my tubes and bias overly hot. Besides I waan't the one looking for help with the 5881s. I was just lending my experience with the original TS 5881. I have already said a few times that I most likely had a bad tube.


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 1:15 pm
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I've been carefully watching these for a few days because of the voltage issue,but recently saw an AC line voltage "restrictor" for lack of a better word in an article somewhere...it was something you made,not a variac...I'll look it up at home.


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 1:33 pm
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Sorry mxvin but I can't look on all "old" posts to see if you are talking about the same amp/volt.

Your Reissue Tung-Sol Vs ...... is a knew post. Start at the beginning, this will help us to ....help you.

You don't remember what was your bias but at 460 volt ! I hope is less than 45 milliamps on each tube's Kathode. And 45 ma is very hot for a Fender, usualy 37 to 30 is better.


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