Run 100x Einstein at 50w

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tony0086

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Hi,

I have a 100w Einstein and have heard that it's possible to run it at 50w by simply removing one of the fuses and therefore only running 2 of the 4 power tubes. I am worried about busting my amp and this is obviously the place to get this cleared up and just have a couple of questions - maybe somebody can help me out...

1. Is this safe to do?
2. If so, which fuse should I remove: the inner, or outer one?

Any help would be greatly appreciated.

Cheers.
 
I can't answer you question directly but why do want to run your Einstein at 50W? The only thing that will change is that you will loose some headroom and the amp will have a bit of a looser feeling, thats it.

I have been wondering for quite a while no why so many people want to pull tubes. Most of them think their amp will become quieter by doing this but that is not or nearly not true. The is only a very little volume difference between 100W and 50W, 3db to be exact.

I don't want to offend you but why not use he amp the way it was build. You won't really gain much with pulling tubes.
 
Thanks for the input.

To be honest I just wanted to hear how much of a difference there would be.
 
Yeah, I know, I'm always curious to try new things as well :D

I'm not to sure if it is enough to pull the fuse. Pulling the tubes will work for sure.
 
Won't the resistance on the output jacks change though, if you do that?
 
Peter said a some time ago that you should not change that with Diezel Amps but in general yes.
 
To make it clearer: Yes the resistance changes and yes, it also does with Diezel Amps BUT Peter said that it is safe and recommended to still operate the amps in the regular way.

I can't find his post anymore but am sure that what he said.
 
attention: if you are referring to the advise he and Olaf gave to ME, than its a little bit different as it was about Herbert and pulling 1 of 3 pairs - then the change is not THAT drastic. if you "half" your tubes i'm pretty sure you also have to change the impendance on the Diezels.
 
petereanima":1l3ir4nt said:
attention: if you are referring to the advise he and Olaf gave to ME, than its a little bit different as it was about Herbert and pulling 1 of 3 pairs - then the change is not THAT drastic. if you "half" your tubes i'm pretty sure you also have to change the impendance on the Diezels.
Click to expand...

thanx for the clarification, I think that is the post I was referring to, seems I mixed things up a little :doh:
 
petereanima":2em0yy6h said:
attention: if you are referring to the advise he and Olaf gave to ME, than its a little bit different as it was about Herbert and pulling 1 of 3 pairs - then the change is not THAT drastic. if you "half" your tubes i'm pretty sure you also have to change the impendance on the Diezels.
Click to expand...


Interestingly enough. With one of three pairs pulled, I would not know how to set the Head/Cab Ohmwise. I would still think you would want to set the head for 4 ohms using an 8 ohm cab, albeit actually 5/6 ohms in actuality.

I do pull two tubes on my Deliverance(VHT). 3db or not, it does make a difference with that head having KT88's. You really have to turn it up to drive the four KT's.
Using only two, you can run it at a much lower volume and still get decent gain.

I would think that an amp using EL34's would not have such a dramatic difference as it is relatively easier to overdrive them than the bigger tubes.
 
yeah, the suggestion was, when 1 of 3 pairs is pulled (it was an emergencay case, as the tubes died and i had a gig the next day and no chance to get to a store), leave everything as it is as the amp takes the little mismatch (5,33 ohm).

and it didnt make much of a difference in the volume btw., but there was interestingly enough - way more high-end, almost "sizzling".
 
Wow - this turned out to be way more interesting that I thought it would!
 
Interesting.

Can you describe the changes more detailed?
I think the Herbert could use a little bit more treble/presence so maybe pulling one pair of tubes would help.

But you used the 4 Ohm out or what do you mean with the missmatch?
(Sorry, my english is not very good)
 
You can pull two of the tubes on the Einy (two inner or two outer) since they are biased in pairs. If you are running an 8 ohm cab, when pulling two tubes, you should run the 8 ohm cab in the 4 ohm output jack. You won't hurt anything.

Steve
 
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