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Old 10th December 2011, 09:08 PM   #4681
Salas is offline Salas  Greece
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1.2R was BL. If you will not use the BIB for more than 30V input you can afford the dissipation created with lowish K170BL without resorting to source degeneration.
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Old 10th December 2011, 09:19 PM   #4682
njepitt is offline njepitt  United Kingdom
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Quote:
Originally Posted by Salas View Post
1.2R was BL. If you will not use the BIB for more than 30V input you can afford the dissipation created with lowish K170BL without resorting to source degeneration.
OK great. I won't get even near 30v input so that's OK.

Thanks again!

Cheers
Nigel
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Old 17th December 2011, 04:56 PM   #4683
tim845 is offline tim845  Hong Kong
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Hi all

I use the circuit in post #1616 for my 6SN7 pre amp filament.

The simplistic Salas low voltage shunt regulator

By the help of Salas, a cheap red LED inserted between the 500 VR and the Jfet, the 500 VR changed to 1K. The V out can be adjusted to 6.3V and feeding 0.6A to 6SN7 (series connection of an ampere meter and a voltage meter across the filament)

A very crude point to point wiring using very curde multi-purpose PCB for an elegant circuit.

Sorry about that I don't know how to make drawing by software for the changes.

Thanks Salas, by the way, how many ideas you still haven't released ? ha ha .............
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Old 17th December 2011, 06:31 PM   #4684
Salas is offline Salas  Greece
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Nice heaters reg. Did it make any change you can perceive? What was feeding the heaters before?
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Old 18th December 2011, 06:46 AM   #4685
tim845 is offline tim845  Hong Kong
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I don't know how to say and even there is no solid evidence such as scientific measurement to proof it, but the fact is using regulator made of individual components other than 3-terminal chip is much better even it is an IDHT, particularly CCS included in the circuit.

My friend has the same 6SN7 pre amp like mine, the same config., the same SSHV regulator but with different output cap. He uses ClarityCap and mine is InfiCap. But his amp is using 3-terminal regulator for the filament. One day a shoot out was held and of course it was a blind test. End up using the individual components regulator for 6SN7 filament is more comfortable and attractive, no kidding, though 6SN7 is IDHT !!

Just like what Rod Coleman said that 3-Terminal chip as regulator is not a good idea and I believe even using one single BJT as passive regulator is still better than 3-Terminal regulator.

Feeding to 6SN7 filament before is the regulator from Rod Coleman. I will use Rod's board to heat the coming project - 6V6 pre amp.
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Old 19th December 2011, 02:39 AM   #4686
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Someone compared directly with LM317/337 combo?
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Old 19th December 2011, 09:46 AM   #4687
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I think it makes more sense to state sonic results using them for DHT (direct heated tubes). Can't imagine that with IDHT, like the 6SN7 is, the difference are audible.
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Old 19th December 2011, 10:27 AM   #4688
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Gianluca, and Paul Needs have certainly reported direct comparison with LT108x

www.audiofaidate.org • View topic - water babies: un line driver DHT e xover passivo

New DHT heater

The explanation for the failure of the 3-pin regulators to give good performance is also given on this page...

... the new version is available, even easier to assemble.
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Old 19th December 2011, 04:45 PM   #4689
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Quote:
Originally Posted by tim845 View Post
I don't know how to say and even there is no solid evidence such as scientific measurement to proof it, but the fact is using regulator made of individual components other than 3-terminal chip is much better even it is an IDHT, particularly CCS included in the circuit.
board to heat the coming project - 6V6 pre amp.
Do you have a schematic for such regulator?
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Old 21st December 2011, 03:14 PM   #4690
tim845 is offline tim845  Hong Kong
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Quote:
Originally Posted by Joshua_G View Post
Do you have a schematic for such regulator?
The current regulator that I use is at the following link:

The simplistic Salas low voltage shunt regulator

If I am not wrong, it is a CCS fed to the pass transistor which is functioned as series regulator.

Anyone please correct me if my understanding is incorrect.

The board from Rod Coleman you better ask him, sorry about that because it is the intellectual properties of Rod.

hope the above can help you.
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