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.
Hi all
I use the circuit in post #1616 for my 6SN7 pre amp filament.
http://www.diyaudio.com/forums/powe...-voltage-shunt-regulator-162.html#post2014178
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 .............😀
I use the circuit in post #1616 for my 6SN7 pre amp filament.
http://www.diyaudio.com/forums/powe...-voltage-shunt-regulator-162.html#post2014178
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 .............😀
Attachments
Nice heaters reg. Did it make any change you can perceive? What was feeding the heaters before?
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.
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.
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.
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
http://www.diyaudio.com/forums/tubes-valves/38248-new-dht-heater-9.html#post2794791
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.
www.audiofaidate.org • View topic - water babies: un line driver DHT e xover passivo
http://www.diyaudio.com/forums/tubes-valves/38248-new-dht-heater-9.html#post2794791
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.
The current regulator that I use is at the following link:
http://www.diyaudio.com/forums/powe...-voltage-shunt-regulator-162.html#post2014178
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.
Salas presented a "SHUNT" regulator.
He does not show a series regulator as part of the regulation operation.
He does not show a series regulator as part of the regulation operation.
Hi Salas
I asked: What do I need to do to get the Reflektor output to 37V?
Your answer:
I guess you mean R7 in the following circuit correct ?
I asked: What do I need to do to get the Reflektor output to 37V?
Your answer:
I guess you mean R7 in the following circuit correct ?
Attachments
I finished the reflektor mods and am now listening to those powering my Benz 28V 48dB riaa.... Not bad at all. Splendid highs, good presence. I am amazed.
My first impressions where not that good so I decided to increase CCS current to 300mA and now it is singing.
I will keep listening and let you know my impressions after a while.
My first impressions where not that good so I decided to increase CCS current to 300mA and now it is singing.
I will keep listening and let you know my impressions after a while.
Happy New Year Ricardo, just curious all Salas shunt regs sounds good with more current🙂
P.S. Pics will welcome.
Reflektor
Happy New Year Salas,
A question for you on the Reflektor; I found the Analog Devices Dual matching PNP transistor - SSM2220, low noise, hfe matched to 0.5%, specs seem similar to the 2n4403. Would these be a good choice for your Reflektor?
Ken
Happy New Year Salas,
A question for you on the Reflektor; I found the Analog Devices Dual matching PNP transistor - SSM2220, low noise, hfe matched to 0.5%, specs seem similar to the 2n4403. Would these be a good choice for your Reflektor?
Ken
After severall hours listening I find the reflektor a very very good performer.
It presents enhanced detail in the bass, maintaining very good presence. Highs are cristal clear and the reg is ultra low noise.
The voltage raises very slowly until it reaches the designed value so I advise a warm up period of 10 to 15 minutes before serious listening.
On Vref I am now using 2000u and 1u at the output zobel.
Raising ccs current from 200 to 300mA was a big revelation.
Salas... congratulations on this inexpensive, super stable and effective design.
PS:
These are old pics.... nowthere are only two 1000u on Vref and a 1u at the output
It presents enhanced detail in the bass, maintaining very good presence. Highs are cristal clear and the reg is ultra low noise.
The voltage raises very slowly until it reaches the designed value so I advise a warm up period of 10 to 15 minutes before serious listening.
On Vref I am now using 2000u and 1u at the output zobel.
Raising ccs current from 200 to 300mA was a big revelation.
Salas... congratulations on this inexpensive, super stable and effective design.
PS:
These are old pics.... nowthere are only two 1000u on Vref and a 1u at the output
Attachments
Last edited:
- Status
- Not open for further replies.