Trimming the tube on the Tonelab LE

[BarryH]

Knowing there are a few Tonelab users on the site, something I found that may be of interest. I was looking on the Tonelab site and following various links led me to a thread about "Trimming the Tube on a Tonelab LE".

Something I hadn't heard of before or was even aware you could do, not having a Tonelab with me at the minute I can't say if it works or not, but it is supposed to improve the tone.

On a different forum it says: 'Trimming your tube' refers to a trim pot regulating the amount of voltage being delivered to your tube. It's similar to biasing a power tube, but this is a way to get an ideal amount of output from the tube that is used in the reactive power sim circuitry.


tonelable.com/forum/viewtopic.php?t=111&sid=4ef5e9dcf2ed5ac6c60881f9098b4936

Cheers
Barry

[garystrat]

Hi Barry

Thanks for this information, I tried it out and mine with a load is spot on 88 with the out the factory setting.

Gary

[BarryH]

Hi Gary,

Did you leave the Tonelab on for the 30 minutes before trimmimg?

I had one come yesterday and tried it from cold and it read 88, after it had been on for half an hour, I tried again and it was showing the two \\ marks. I turned the screw until the 88 came up in the window.

Cheers
Barry

[asimmd]

Well I've got a tonelab,blue one that sits on my desk and I can't see a rename button nor have I got a hole between the output jacks.

Maybe I have the wrong tonelab.

Someone care to elaborate please.

Alan

[BarryH]

Alan, the secret's in the title, "Trimming The Tube on the Tonelab LE" ;D

Somewhere in the manual for the SE (two pedals) model it tells you how to trim the tube for an improved performance. Someone noticed there were similar screws on the LE (one pedal) model and tried the same trick and it worked although it's not listed in the LE manual.

Cheers
Barry

[asimmd]

DOH !!!!!Sorry,having a senior day today.

Alan

[garystrat]

Hi Barry

Just tried it again after it had been on for some time (well over half an hour) and still get 88.

However, if switch my computer program on to play I get pitch tone and //// comes up, still connected to the computer and program off it returns to 88?

Out put from the Tonelab to my ear is excellent, so not sure if this something to worry about?

I now have the George Dennis picks and find them to be excellent, they have also improved my accuracy. I will let my friend who is a professional HBM tribute artist try them tonight and see what he thinks.

Gary

[BarryH]

Hi Gary,

I've not found anything about when the computer's connected, I would think as long as you get the 88 showing in normal mode the Tonelab should be at it's best.

Good to hear you like the George Dennis picks.

Cheers
Barry

[garystrat]

Hi Barry

Many thanks for the advice, I think Tonelab must be OK as I get very good results with it, but very interesting thread as I too had not heard of this before.

My friend tried the the George Dennis pick last night, and continued to use it throughout the whole evening. He told me intends to continue using that one for the time being and I will supply him with another as a spare.

Gary

[BarryH]

This is for Alan mainly, it's a link to one of the Tonelab Service Manuals.

I've always known the purple/blue model as the "Desktop" but it looks as though it could be called the "TT" not sure.

www.tonelab.net/files/ToneLab-service-manual.pdf

Cheers
Barry