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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 11:25 am
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bluesky636,

You are correct, the spec sheet says 500V for the JJ 6V6, which is well above the amps supply voltage and should work just fine in place of the 6L6. The 6V6 tubes lower Plate dissipation rating merely requires the bias adjusted to a safe level for the 6V6, as you pointed out before. :)

63supro,

The 6V6 will be less stressful on the OT than a 6L6, so no problem with the OT being affected at all. And, the 6V6 pulls less filament current than a 6L6, so less stress on the filament supply part of the power transformer also. Remember, the 6V6 was originally developed as a replacement for the 6L6, specifically to use less power for improved battery life in radios that used 6L6 tubes. Replacing the 6L6 with 6V6 will also mean less heat in the amp, adding to the other components life. The tubes ability to handle higher Plate voltages is really the only concern in using 6V6 in place of a 6L6. It seems that Bob at eurotubes is saying that no other 6V6 will work. Not sure I believe that, but maybe he's right. :)

My only question would be about the impedance, if there is much difference between the two types of tubes. :?:

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 11:37 am
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About impedance read my post , 1st page


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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 11:40 am
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As Arjay explained "Plate-to-plate impedance for a pair of 6L6/5881's in class AB operation is roughly 5k ohms. 6V6's want to "see" around 8k ohms."
Arjay, strattele52, Tis-san and myself all have concerns about this. In this case I would consider it risky.
A tube being able to handle the plate voltage is only a part of the equation. :wink:

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 12:10 pm
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I'm no tech so sorry if it's a stupid question,but are there any mods that could/should be done to make this safer for the amp? Because the way it sounds now,it's the amp I wanted it to be & I REALLY don't wanna go back to the 6l6's.You'd have to hear/play it to appreciate the improvement in tone it made but it's night & day.


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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 12:21 pm
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I see what you mean, thanks. That is really no problem at all as far as impedance on the output transformer is concerned, say a 4 or 8 or 16 ohm speaker. The efficiency is the only concern with impedance matching. Maybe we can get Tissan to weigh in on this, but I don't see the tubes impedance difference as anything to be concerned about, it isn't that much different, the bias adjustment will reduce the current. :idea:

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 12:22 pm
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If you like it and are aware of the risks and are good with it, then roll with it. Like I said, I would go with an attenuator or a lower wattage amp like a Deluxe Reverb. The amp was designed to run 6L6/5881 power tubes. You could be luck and run a pretty good while with no problems. It's just a bit risky that's all.

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 12:36 pm
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A Deluxe Reverb ain't gonna sound like this,a tweed deluxe ain't loud enough & a boutique is gonna be too expensive.The attenuator option will only lower the volume,not get that Deluxe/Bassman mongrel tone that I'm seriously diggin'.


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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 1:34 pm
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I'll be straight forward.

A number of people have expressed concerns about this tube configuration in a 59 Bassman LTD. All of them are people whose opinion (and let me emphasize "opinion") I have come to respect. If any one of them came out and said that they have tested a JJ 6V6S tube in an amp designed for 6L6 type tubes and that they found that the comibation sounded like angels singing or caught fire immediately, I would believe them. However, none of them have. All that has been quoted have been specs, 50 year old books, and tube theory. None of them have analyzed the JJ 6V6S to determine if it is up to the job. Obviously, neither have I.

On the other hand, Bob at Eurotubes says that they have thoroughly tested the JJ 6V6S in every amp that they recommend it to be used in whether it is a direct replacement for a 6V6GT or a 6L6GC. They have clearly spelled out the conditions in which it must be used. Why should anyone doubt the veracity of their claims? Yes, they are in the business to sell tubes. But they are also a user of the same tubes. The liability that they would face if one of their recommended tube combinations damaged an amp is significant. Any lawyer could eat their lunch. I think that it is significant that Eurotubes sells only JJs as opposed to many other tube dealers out there. It also appears that Eurotubes has a working relationship with JJ to design new tubes and improve existing ones.

Given the comments that have been posted in this thread (all very well thought out and presented), would I hesitate to buy this tube set for a 59 Bassman LTD, or replace the current tube set in my BDRI with this set? If the sound/performance provided by this tube set is what I was after, I would not hesitate for a second.

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 1:43 pm
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bluesky636 wrote:
If the sound/performance provided by this tube set is what I was after, I would not hesitate for a second.


It's not only what I was after,it by far exceeded my expectaions,& yes I think I did hear angels singing. :D


Last edited by emanym on Tue Jan 18, 2011 1:56 pm, edited 1 time in total.

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 1:51 pm
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emanym wrote:
bluesky636 wrote:
I'll be straight forward.
If the sound/performance provided by this tube set is what I was after, I would not hesitate for a second.


It's not only what I was after,it by far exceeded my expectaions,& yes I think I did hear angels singing. :D


Excellent. :D

Do you know a good lawyer? Just in case, of course. :lol:

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Post subject: Re: Anyone tried 6v6's in a Bassman LTD?
Posted: Tue Jan 18, 2011 4:55 pm
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Hammond transformer for the PT1615 transformer specs 5000 ohms for 6L6 or 6V6 ..

http://www.hammondmfg.com/1608A.htm

So go fot 6V6 if you like the sound


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