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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 3:40 pm
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mxvin wrote:
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.


lookk at the two quotes above. One from you and my reaponse that was previously in this thread.

statele......I mentioned in this thread about this topic started by somone else. I didnt start this thread nor am I having problems with my current set of 5881s. I am mearly trying to help the original poster of this thread. I am going back about 3 years when I ahd this issue so no I really dnt remember my exact bias. But I had to venture a guess its probably around 34 to 37 mA. Thats where I usually like most tubes in my SR. I bet the VDC is prob more like 465 as well.

SO....getting back to the original issue in which Rebesoul didnt really have a problem at all he actually digs the orig 5881s. My comment was just what happned to an original TS5881 that I had. There is actually no problem with my amp nor RS's.......


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 3:54 pm
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Thank's mxvin, I understand. Please don't forget I'm french speaking and sometimes I may not understant American speaking people .

It's a pleasure to talk to all the people on the forum but sometimes it is very difficult for me


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 3:59 pm
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stratele52 wrote:
Thank's mxvin, I understand. Please don't forget I'm french speaking and sometimes I may not understant American speaking people .

It's a pleasure to talk to all the people on the forum but sometimes it is very difficult for me


And it's our pleasure to have you here, mon amí!

Rawk on!

8)

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 4:12 pm
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Thank you Retroverbial,


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 5:06 pm
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I'm at home now so I can look at my notes...I had 476.8 volts,biased @ 33.1Ma which I understand to be 15.7 watts....am I right?


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Mon May 16, 2011 5:26 pm
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stratele52 wrote:
Thank's mxvin, I understand. Please don't forget I'm french speaking and sometimes I may not understant American speaking people .

It's a pleasure to talk to all the people on the forum but sometimes it is very difficult for me

no worries stratele.....I understand and you are communicating very well. I am new to these boards but I do enjoy checking in here as well.


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Tue May 17, 2011 2:23 am
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Rebelsoul ; right about 15.7 watts


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Sat May 21, 2011 8:33 am
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Retroverbial wrote:
Awfully hot, Reb.

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

But hey, I'm a conservative. YMMV

Arjay

You know RJ,you have me thinking here,that Super is a model that is different from the schematics in that it's marked a 5G4 on the tube chart,(I'm told no schems are to be found for that model) but the tubes are marked 6L6GC,the 6G4 models are the "center volume" amps with 6L6GC tubes,and the 6G4A uses 5881s and the volume was moved to the regular position.
My amp has the regular volume configuration,and my friend told me the pots looked to be original but the tone section didn't follow the Super but were the same as the 6G8 Twin...to confuse matters more.
We know that the transitional Brown amps were tweaked and experimented with by Leo and his crew...having said that,I've been kind of worried with the voltage on the 5881s that I put in,so I'm probably going to put some SED 6L6GCs in it for some less stress,I don't like having to think I'm running things over the limit.
What do you think...make sense?


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Sat May 21, 2011 10:06 am
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Rebelsoul wrote:
Retroverbial wrote:
Awfully hot, Reb.

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

But hey, I'm a conservative. YMMV

Arjay

You know RJ,you have me thinking here,that Super is a model that is different from the schematics in that it's marked a 5G4 on the tube chart,(I'm told no schems are to be found for that model) but the tubes are marked 6L6GC,the 6G4 models are the "center volume" amps with 6L6GC tubes,and the 6G4A uses 5881s and the volume was moved to the regular position.
My amp has the regular volume configuration,and my friend told me the pots looked to be original but the tone section didn't follow the Super but were the same as the 6G8 Twin...to confuse matters more.
We know that the transitional Brown amps were tweaked and experimented with by Leo and his crew...having said that,I've been kind of worried with the voltage on the 5881s that I put in,so I'm probably going to put some SED 6L6GCs in it for some less stress,I don't like having to think I'm running things over the limit.
What do you think...make sense?


As far as the pushing the limits of the orig 5881s it makes sense to go with the SEDs for now. But if you want to try the TS RI 5881s they are pretty cheap for a matched pair and they can handle the voltage. I cant attest for how close (or not) to the orig tubes they sound but I can tell 100% that the tone the put out is great in my BFSR and they are different flavor than the 6L6GC for sure. Matched set is between 35 and 40$$.


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Sat May 21, 2011 3:29 pm
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Man,I'm a tube swapper,I always try several different sets in an amp until I'm satisfied.
I started out with some Groove Tube 6L6GCs,but thought there could be some better tone in there,next went in some Philips NOS 6L6WGB's and it got better...but always the obsessive/compulsive person that I am,I wasn't satisfied,then I bought some of the Reissue Tung-Sol 5881s and it was getting close,so I figured the NOS T-S 5881s would be the cat's meow and they were...until I got the voltage jitters :lol:
So today I put in the SED 6L6GCs,and the amp sounds better with 6L6GCs...I knew the SED tubes were good,I have them in a '66 Pro Reverb and they rock.
So,5 sets of power tubes in a few months and I think I have the best in there now for the price. :D
Most of this is just for fun,being a tone chaser is stress relief for me,and I think you can always find something better...if only in your mind. :mrgreen:
Final bias for the SED's 471 volts,35mA,16.4 watts.


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Sat May 21, 2011 4:12 pm
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The T-S re-issues are likely built to tolerate higher plate voltages than the original NOS bottles. The winged C's from SED are also good glass but shouldn't be pushed beyond 465 VDC -- they're prolly the best choice for your 6G4 in terms of vintage tone and durability. A shame there are no more to be had.

Arjay

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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Sat May 21, 2011 4:34 pm
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As you prolly already know, the NOS 6L6WGB whether made by TungSol, GE (Canada), Sylvania, etc... is a 5881. And is just a consumer name for the exact same mil spec 5881 version.

I was able to buy a bunch, like 5 years ago, off the Bay... from someone who thought they were not the same. And got a good price. I sometimes still see 6L6WGB's for a lesser price than TS 5881's.

https://www.tubeworld.com/5881ts.jpg


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Sat May 21, 2011 4:41 pm
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Okay y'all,what's the general concensus,if there is one,...the best current production 6L6,able to withstand high voltages and durable with tone?
Ya see,most of my amps were /are 6V6 types,and I don't have a slew of 6L6 tubes.

**I just took a wall reading 125.5 vac...even though I work for the evil electric dept....we're putting out some high voltage for my vintage amps. :(


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Sat May 21, 2011 6:05 pm
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For 5881/6L6WGB use the 1980's Reflektor made 6P3S-E is pretty good. Data on the Net shows only the 6P3S (non military spec)----which is the commercial tube that has much lower ratings than the mil spec made tube. The commercial 6P3S is a terrible tube. Avoid this one.

I've used this tube with pretty good success. Get the coined-based tubes. These are pre-Gorbachev made tubes. Which are much better. Mine came with "sickle-hammer" symbol. "OTK" stamping. "Reflektor" logo. Triangular symbol with manufacturing date of like: "X 79 " = Oct 1979. You can use the tube holders with the coin-based tubes, they will fit right between coin-based and the bottle.

And yes they can handle 425-450 VDC plate voltage. Bias for 5881. Start at about 15 watts idle dissipation per tube. Fine tune to tone. I usually get about 32-34 watts per dual 5881 Fender amps.

They have a warmer midrange than the typical 6L6GC. Kinda like the NOS TungSol 5881. Pretty good headroom. Pretty tough tubes.

http://i.ebayimg.com/00/$(KGrHqV,!iME2L ... w~~_12.JPG


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Post subject: Re: Reissue Tung-Sol vs. American Tung-Sol 5881....!!!
Posted: Sun May 22, 2011 1:26 am
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Rebelsoul wrote:
Okay y'all,what's the general concensus,if there is one,...the best current production 6L6,able to withstand high voltages and durable with tone?


I've installed Rubys and EHX in many of my clients' amps with no complaints thus far (I've also been "field-testing" a pair of EHX 6L6's in a personally-owned '66 Bandmaster for a year and a half with excellent results).

YMMV

Arjay

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