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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Thu Jan 13, 2011 10:31 am
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stratele52 wrote:
Ummm, did you read the Eurotubes kit description in my post? That is the whole idea of this kit: lower power and earlier breakup----bluesky

No, at the time I write I did not read what Eurotube kit description.

My question is; can you have enough negative bias voltage to accomodate the 6V6 low power ?


Once again, from my posting above:

Like I said, considering the liability if something went wrong, one has to believe that Eurotubes has thoroughly vetted this kit. On their website they say:

"We get questions all the time asking if running 6V6's in Hotrod Deluxe amps, or running KT77's in a JSX, or running KT88's in a Dual Rec will hurt the amp? The answer is that we would of course, never recommend anything that would hurt your amp. Before we recommend any retube kit we thoroughly test the amps ability to run the tubes and whether or not the combination sounds good. We don't recommend tubes just because a player posted on a forum somewhere that a particular combination worked good for him, unlike some other tube vendors we do our own research."


I would say that Eurotube's answer to your question is "Yes".

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Last edited by bluesky636 on Thu Jan 13, 2011 4:38 pm, edited 1 time in total.

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Thu Jan 13, 2011 3:52 pm
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I put a 5U4GB and Tung-Sol 5881's in mine

marked tone improvement and a bit earlier break up.

the filament voltage is higher in the 5U4GB than a GZ34, however the tranny seems up to the task so far.

Still I won't suggest it as a safe operating proceedure.

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Thu Jan 13, 2011 6:18 pm
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bluesky636 wrote:

You mean the one that was written before JJ developed their 6V6s? :D

http://www.bunkerofdoom.com/tubes/rc25/index.html

Also , see my post just above this one.



That's for the link. Much appreciated. :)


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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Thu Jan 13, 2011 7:20 pm
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Guitarist1983 wrote:
bluesky636 wrote:

You mean the one that was written before JJ developed their 6V6s? :D

http://www.bunkerofdoom.com/tubes/rc25/index.html

Also , see my post just above this one.



That's for the link. Much appreciated. :)


Google is your friend. :D

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Fri Jan 14, 2011 3:13 am
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blues bondman You talk about rectifier filament voltage ?

GZ34 need 1.9 amp filament current and 5U4 , 3 amp. So if you put a 5U4 in your amp the filament voltage at this rectifier could be lower than GZ34 because there is more load on the power transformer .

If your voltage is very close to 5 volts, this mean the power transformer can handle this load. Almost any fender amp can handle this tube.


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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Fri Jan 14, 2011 6:37 am
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Exactly strattele52

the 5u4GB + the 5881's = More SAG slightly lower overall wattage.

A little less beast and a bit more tone.

The biggest improvement was to sell off the Import Jensens and put in Weber CTS (Chicago) speakers !!!

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Fri Jan 14, 2011 7:58 am
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bluesky636 wrote:
Retroverbial wrote:
bluesky636 wrote:
I don't see "plate-to-plate impedance" listed, but here is JJ's spec sheet:

http://www.jj-electronic.com/pdf/6V6.pdf


Try reading "the bible"......

That's the RCA Receiving Tube Handbook.

Arjay


You mean the one that was written before JJ developed their 6V6s? :D

http://www.bunkerofdoom.com/tubes/rc25/index.html

Also , see my post just above this one.



I agree. Way too risky. As much as I like Bob at Eurotubes, he's not going to repair your amp when it gives up the ghost. Just because you "can" do something doesn't mean you "should". There endith the lesson. I'm a firm believer in doing what an amp is designed to do/handle. I you want a 6V6 powered amp, You should buy one. JJ's are fine tubes, but when he says JJ's and only JJ's can do this, it gets me a little nervous.

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Fri Jan 14, 2011 1:26 pm
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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 3:30 am
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Well,too late.I already ordered & put 'em in.When I spoke with Eurotubes on the phone they assured me that they are safe for the LTD.However I typically don't entirely trust any salesman until they've earned that trust & this is my first experience with Eurotubes.I did do a google search first as well & all I found on the 6v6/BM topic was a post on TDPRI & the guy was very happy with them & hadn't had a problem yet in approx 6 months.They DO sound fantastic in the amp & do exactly what I wanted & more.Not only does the amp breakup at a more manageable volume,it just sounds better to me eq-wise.The bass is no longer overly boomy/flabby,the shrill high end is gone & the mids are much more musical to my ears.With a boost (OD pedal w/ gain down low/level maxed) it gets everything from clean to mean & all the bluesy goodness in between just from the guitars volume knob,with the pedal off it sounds like a good clean tweed tone right before breakup.I haven't had a chance to try it with the band yet & unfortunately we aren't rehearsing again until after this weekends gig,so I'm gonna take a back up just in case.I have been using it at home though the last few days for hours on end at approximately gig level with no problems, but I'm still a little scared.Had I read Arjay & supro's posts first I wouldn't have ordered them at all because I do trust those guys,but it's too late now that I've heard it to turn back.I really hope they prove to be reliable because it's very difficult to imagine going back to the 6l6's now.


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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 6:57 am
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emanym wrote:
Well,too late.I already ordered & put 'em in.When I spoke with Eurotubes on the phone they assured me that they are safe for the LTD.However I typically don't entirely trust any salesman until they've earned that trust & this is my first experience with Eurotubes.I did do a google search first as well & all I found on the 6v6/BM topic was a post on TDPRI & the guy was very happy with them & hadn't had a problem yet in approx 6 months.They DO sound fantastic in the amp & do exactly what I wanted & more.Not only does the amp breakup at a more manageable volume,it just sounds better to me eq-wise.The bass is no longer overly boomy/flabby,the shrill high end is gone & the mids are much more musical to my ears.With a boost (OD pedal w/ gain down low/level maxed) it gets everything from clean to mean & all the bluesy goodness in between just from the guitars volume knob,with the pedal off it sounds like a good clean tweed tone right before breakup.I haven't had a chance to try it with the band yet & unfortunately we aren't rehearsing again until after this weekends gig,so I'm gonna take a back up just in case.I have been using it at home though the last few days for hours on end at approximately gig level with no problems, but I'm still a little scared.Had I read Arjay & supro's posts first I wouldn't have ordered them at all because I do trust those guys,but it's too late now that I've heard it to turn back.I really hope they prove to be reliable because it's very difficult to imagine going back to the 6l6's now.


Not meaning any offence to Arjay or Supro, but their opinions are based on theory and 50 year old books. If one is willing to believe Eurotubes, they have actually installed and tested these tubes in all the amps they sell the kits for. So if they say that the tubes are safe, I have no reason to doubt them. I had the opportunity to buy a similar kit for my BDRI but did not simply because I preferred to stick with 6L6GCs for the clean head room vice early breakup.

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 7:17 am
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No offense taken. The reason being the Bassman LTD is supposedly based on a 50 year old amp design so the 50 year old books still work. Actually, tube amp designs basically still follow the same 50 year old books and are still the bible. Amps are modified, but the basic concepts still ring true. It's your amp, but if it starts acting up in any way as the tubes wear, I'd pull them.
Good luck with them.

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 9:28 am
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That's the beauty of the science of electronics, it doesn't matter whether a salesman uses it, or an electronics guru uses it, it is always the same, 50 years ago and today. Opinions don't matter at all. If the spec sheet, or tube manual, says that a tube can handle X Plate Voltage and Y Plate current, then it is OK, period. :)

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 10:25 am
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shimmilou wrote:
That's the beauty of the science of electronics, it doesn't matter whether a salesman uses it, or an electronics guru uses it, it is always the same, 50 years ago and today. Opinions don't matter at all. If the spec sheet, or tube manual, says that a tube can handle X Plate Voltage and Y Plate current, then it is OK, period. :)


If I am comparing these two data sheets correctly, it looks to me like the JJ 6V6S can handle it:

http://www.jj-electronic.com/pdf/6V6.pdf

http://boozhoundlabs.com/howto/pdf/6V6GT.pdf

Couple that with the fact that Eurotubes has tested the tubes in the Bassman LTD (I have no reason to not believe them), it seems to me that the JJs are a viable option.

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 10:28 am
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63supro wrote:
No offense taken. The reason being the Bassman LTD is supposedly based on a 50 year old amp design so the 50 year old books still work. Actually, tube amp designs basically still follow the same 50 year old books and are still the bible. Amps are modified, but the basic concepts still ring true. It's your amp, but if it starts acting up in any way as the tubes wear, I'd pull them.
Good luck with them.


Well, we already know that the Bassman LTD is a PCB amp vice turret/P-to-P and it has an adjustible bias that the orginal did not. Are the transformers different? What other differences there are between the two I do not know.

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 10:39 am
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It's not the tubes being able to handle it, it's the output transformer as several of us have stated that may suffer down the road. Bob has JJ making some pretty sturdy tubes. Think about it. JJ 6V6 and only JJ 6V6 tubes are capable of doing this. Personally I'd use either a less powerful amp or an attenuator. it's your amp, you do what you want. Certain tubes are used in certain amps for good reasons. Usually design, reliability and tone. How long do you think Bob tested the amp? Hours, days, weeks, years? The HRD series amps were thoroughly tested too right?

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