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Old 27th November 2011, 07:00 PM   #131
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when you're going with AC , that's old school approach , in which case you're accepting these things .

if you're caring more about those things - go for DC and regulate

for indirectly heated tubes I prefer constant current approach for any type ( be it current or voltage primary defined ) and for DH tubes - see Rod Coleman's approach
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Old 27th November 2011, 07:18 PM   #132
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Well Allen was reaching for the best sound and to build a reference class preamp, and he did it. If heater current regulator were maybe contributing to only 5% of it, he would certainly choose it.

And if you're trying to build as good a preamp, it is worth it to try it as well. It no big deal. Use one current reg per tube and adjust the current programming resistor according to the chosen tube. As simple as that.

This preamp was one of Allen life achievement. He worked on it for years, perfecting every aspects and working hard to extract as much juice as he can. I'll follow his advice any time
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Old 27th November 2011, 07:23 PM   #133
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Originally Posted by Joshua_G View Post
Current regulators to supply the tubes' heaters prolong tubes life.
I have been running the same tubes in my first FVP5 for about 7yrs now - with no sign of them going any time soon. That's been a lot of hours. I always run my heaters at 6V to prolong tube life (a proven method with no sonic penalties).

I would not dissuade anyone from pursuing their dream amp to the 'nth order - but just realise that beyond a certain point its mostly all in the mind. By choosing the design you are already at the top table as far as I am concerned, and I would bet that a cheap implementation would sound almost the same in a blind comparison.

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Old 27th November 2011, 07:31 PM   #134
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that's fun thing - taking care about details ;
when making your own ( either starting from scratch or by someone else's design ) some ppl are enjoying in every detail , some not .

there is nothing wrong in gilding the lily ; over-engineering can be wrong

in Allen's work I can't see one sole detail of over-engineering , and some things reminding to gilding the lily are , say , precautions developed in many years of work .

edit: not arguing or debating ..... just contemplating about things which I can see in my own approach to .... gilding the lily

sheer pleasure sometimes can be valid reason .
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Old 27th November 2011, 07:39 PM   #135
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Years of work ? Come on, let's keep our feet on the ground. We are not talking about developing the atomic bomb.........
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Old 27th November 2011, 07:43 PM   #136
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that's why you can find zillion of mediocre tube preamps on the net , and just few good ones .
not even to mention that some are selling drek as HiEnd
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Old 27th November 2011, 07:55 PM   #137
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I can see a better current inrush in heaters but what about Hi-frequence oscillations
Would something like a LM317 be fine ? Lets think like Allen, we must find the best for the preamp.
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Old 27th November 2011, 08:20 PM   #138
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LM317 as CCS is good enough for purpose , if you're keeping HF garbage out of heater circuit , just because 317 is good as snail in suppressing high freq noise;

elevating heater potential to proper voltage is a must , both for "lower" and "higher" triode systems in stage , with purpose to prevent any possible leak between heater and cathode;

I paid my school about that , building Anzai pre from Elektor , when I was a kid ; it took me 4 years of learning things to make proper preamp of it
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Old 27th November 2011, 08:24 PM   #139
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Quote:
Originally Posted by choucroutemelba View Post
I can see a better current inrush in heaters but what about Hi-frequence oscillations
Would something like a LM317 be fine ? Lets think like Allan, we must find the best for the preamp.
AFAIK, there is no HF oscillations caused by the heaters. DC elevation of the heaters is a good thing to do and it's mentioned in Allen's schematics. LM317 is fine as either voltage or current regulator for the heaters.
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Old 27th November 2011, 08:42 PM   #140
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Default CCS+CVS

CCS is not as easy as mentioned if we need a CVS first !
Do you think Allen were gone this way ?
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