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In Reply to: RE: My question was meant to be generic posted by gusser on March 11, 2015 at 11:07:57
The point I was attempting to make, or more accurately, what I was attempting to learn was if any subjective sonic improvements were simply due to the increased voltage caused by the substitution of a low DCR choke.
A bucking transformer, as well as NTC limiters are a wise choice for these old amps.
Thanks.
Follow Ups:
Yes, swapping out legacy chokes with low DCR parts can certainly make sonic improvements. As you will be pushing the B+ up a significant amount, most amps will sound better when operating at higher B+.
But the rub is you are now possibly stressing tubes and other components. And especially the 50 year old components that can be fragile.
My advice is to measure the B+ and make sure you aren't stressing anything with your new low DCR chokes.
Which was my point.
So I should be able to get the same sonic benefit by increasing B+ and leaving the choke alone.
I would say yes. Because replacing say a 2h 50ohm DCR choke with a 0.35uh 5 ohm choke would elevate the B+. However you have now lost a significant amount of ripple filtering with the millihenry sized choke.
So if more B+ is your goal, reducing the choke DCR is only a good option if you can maintain the same or close henry value.
And again I must stress that bumping up the B+ to get a more dynamic or aggressive sounding amp is not a good practice. Most commercial amps were designed at the optimum operating points. Some even beyond that such as Dynaco because tubes were cheap in those days. And remember that line voltage in the 1950/60s was 110-115v. Today we have 120-125v.
You really need to carefully analyse the circuit before raising the B+.
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