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Re: bugle boy tube bias blues and other tunes

Thanks so much for helping me with this Tre'.

I tried cleaning all of the power and driver tube trim pots to see if that would make a difference in the bias "range" dialing of the driver tubes. Sure made biasing a lot quicker with almost zero fluctuation once set. But in the end none of the suspect New or NOS tubes could be dialed in any lower, still over 100.

I should also mention that none of the dialed trim positions have ever really waivered much over the years, and they all are pretty much mirrored from left to right channels. This must be good.

On the asylum about a year ago that I posted that I couldn't dial in some new sovtek 6922's. One inmate replied they were probably out of spec. That's when I first tried some really old tubes I had kicking around for the first time. I found I could easily dial them in, was blown away by the sound, and got into the whole NOS use, at least in the critical positions, ie sections V1, V2, V3. Eg Phillips, RCA, Bugle Boy, etc.

But it just doesn't seem right that if I buy 7 new sovteks to have on hand for back-up emergency situations (eg. while bidding on NOS, ha, I'm hooked!). Likewise 4 new sylvanias that I bought in the 80's and never used, and can only dial in 4 out of the whole combined batch of 11.

Now one of the Bugle Boys that worked fine until my rolling. And one(1) of the bugle boys that I had ordered as a spare matched set a year ago but never tested at the time. Serves me right if it turns out to just be bad and out of spec tubes in the end!

Sorry for reiterating my previous post by laying out all the facts again, but it's therapeutic!

Also, I can't quite figure out going through the archives if a tube is bad/going bad if the bias can't be dialed up/down or either?

Whew, thanks for reading all this!



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  • Re: bugle boy tube bias blues and other tunes - Jonesy 11:17:01 04/22/07 (0)
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