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Lightning ps. How good are they interms of musicality and hum?

81.233.250.186
Posted on January 20, 2017 at 00:54:04
pix
Audiophile

Posts: 411
Location: sweden
Joined: March 18, 2006
 I´m just about to order some Rod Colemans regulators for:

1. 300B filamament supplies, go get rid of hum.
2. For a really quiet filament bias in a 4P1L lime amplifier.

But reading about your findings about lightning ps got me wondering.
Would you say the ligntning filament supplies could compete to Rods regulators (with a traditional DC power suppy) in terms of musicality and noice/hum rejection?



 

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RE: Lightning ps. How good are they interms of musicality and hum?, posted on January 20, 2017 at 03:06:05
drhighmu
Audiophile

Posts: 3
Joined: January 20, 2017
 It will be highly unlikely that lighting supplies will work with filament bias .

For the 300B application , it should be easy enough to try both schemes to see what sounds best

DHM

 

what kind of builder, posted on January 20, 2017 at 06:03:34
RayP
Audiophile

Posts: 727
Location: Maryland
Joined: June 30, 2005
 Maybe I am wrong, but I don't remember anybody achieving low voltages (6.3 and below) with the halogen units so far. 10 vac and 20 vac are achievable.

My advice would depend on what kind of builder you are. If you regularly build amps and would like to experiment, then try the high frequency AC heating. It's inexpensive and doesn't take up much room.

However, if this a 'statement' amp and you won't build another for quite some time, take the safe route with the Rod Coleman regulators which are known to produce good sound. You can then plan your layout to take account of the space needed for the regulators, heatsinks, transformers etc.

ray

 

RE: what kind of builder, posted on January 20, 2017 at 16:12:05
used-hifi
Audiophile

Posts: 1100
Location: Surprise AZ
Joined: March 18, 2003
 Ray which halo lighting transformer you can who heartily recomend for the gm70??



please include a link or where to purchase please


I would like to experiment with something else besides rod's regulators

the regulators are excellent but man there is some much added crap I would like to simplify it some


Lawrence

 

RE: what kind of builder, posted on January 20, 2017 at 17:00:22
deafbykhorns
Audiophile

Posts: 1067
Location: Florida
Joined: October 17, 2003
 Add 5 turns to the output toroidal and you get 20volts
These have been tested and work well
I have tried both the Coleman and the Ultrasonic, i could flip a coin on either one but the halo is much easier to implement.

 

RE: what kind of builder, posted on January 20, 2017 at 17:03:19
used-hifi
Audiophile

Posts: 1100
Location: Surprise AZ
Joined: March 18, 2003
 Thank you very much!!! I will order right now


Lawrence

 

RE: what kind of builder, posted on January 20, 2017 at 17:11:39
RayP
Audiophile

Posts: 727
Location: Maryland
Joined: June 30, 2005
 You can see how I got roughly 20 vac here in the attached link and what I used.

Remember that my amp is just a think piece trying out technologies and ideas that would reduce weight. It sounds very good on well recorded pieces with incredible detail. However, it can sound quite shrill on less well recorded pieces. Tracking down what is causing what has been a matter of trial and error, but it has been fun.

From past experience with a line stage, the detail comes from using the 6S17K-V input tube. I think the shrillness comes from my implementation of the high voltage from the 48 vdc smps units. Shielding helped as well as using some capacitors, but I think I have more work to do.

As to the halogen units, I doubt that they affect the sound all that much compared to the other issues going on in my amp. In any event, try them and see if they work for you. They certainly are cheap enough.

ray

 

RE: what kind of builder, posted on January 20, 2017 at 17:14:43
used-hifi
Audiophile

Posts: 1100
Location: Surprise AZ
Joined: March 18, 2003
 Thanks Ray I ordered them units that defbykhorns suggested and there wont be much time to wait because there right here in the states :)


If these sound as good as the colmen regs I will be tickled pink



Lawrence

 

tried both methods, posted on January 20, 2017 at 17:19:19
RayP
Audiophile

Posts: 727
Location: Maryland
Joined: June 30, 2005
 Well that is very interesting and I thank you for comparing both methods. Somehow I suspect using high frequency AC will now become quite common for directly heated tubes.

ray

 

RE: what kind of builder, posted on January 20, 2017 at 17:21:21
banpuku
Audiophile

Posts: 1008
Joined: January 19, 2006
 Can these be used with tubes requiring 6V and 3amps? If so, how would the voltage be adjusted down to 6V? Resistor?

 

RE: tried both methods, posted on January 20, 2017 at 17:22:51
used-hifi
Audiophile

Posts: 1100
Location: Surprise AZ
Joined: March 18, 2003
 Ray we shall see I have an optimized rod colman heater setup here with common mode torroid choke 124mv ac going into the colman regulator its down into Uv range on the output, well see if it compares

alot of my amplifier is NON conventional that works very well so this happens to be up my alley

Lawrence

 

RE: what kind of builder, posted on January 20, 2017 at 17:29:50
used-hifi
Audiophile

Posts: 1100
Location: Surprise AZ
Joined: March 18, 2003
 yes you could use a resistor but totally not the best idea just unwind some off of the torroid and measure under load until you get desired voltage



Lawrence

 

RE: tried both methods, posted on January 20, 2017 at 17:31:05
used-hifi
Audiophile

Posts: 1100
Location: Surprise AZ
Joined: March 18, 2003
 Ray are you biasing the gm71 tube at 95ma?

if so what would be the life expectancy? I am curious to bias my gm70 there also


Lawrence

 

RE: tried both methods, posted on January 20, 2017 at 17:39:01
RayP
Audiophile

Posts: 727
Location: Maryland
Joined: June 30, 2005
 So far I have kept the current at less than 100 ma. It's easy to adjust using the Powerdrive circuit and the main limitation is what current your output transformer can handle.

The GK71 pentode has a plate dissipation of 125 watts and 576 volts times 95 ma is only 55 watts. I suspect some would suggest that I raise either VDC and / or current to get more power, but I don't need to.

ray

 

RE: tried both methods, posted on January 20, 2017 at 17:59:35
used-hifi
Audiophile

Posts: 1100
Location: Surprise AZ
Joined: March 18, 2003
 I just adjusted mine LOL took some of the led's out in series now biasing 97.5ma about 119watts plate dissipation

you can hear an improvement it just sounds better to my ears

this is why I love breadboards :)


now the question would be how many hours will the gm70 tube last at this dissipation???

Lawrence

 

RE: what kind of builder, posted on January 21, 2017 at 04:09:45
deafbykhorns
Audiophile

Posts: 1067
Location: Florida
Joined: October 17, 2003
 You will need the 220v at 120 input supply to get that low

 

I found some... Could yhis be usefull?, posted on January 23, 2017 at 22:47:39
pix
Audiophile

Posts: 411
Location: sweden
Joined: March 18, 2006
 I found some cute suggarcube-sized SMPS in the socket of GU10 (5W) LED light bulbs.
Having those loaded with 23 Ohm gave me an output of 5Vdc and 200mA (=1W)

I figure this could be used as a filament supply for my Telefunken RE114 DHT´s (calling for 4V / 150mA filaments)which has previousy been feed with a battery supply.

Since the RE114 is from the 20-30-ties I am a bit worried though about if inrush current etc could burn the cold delicate filaments of the RE114.

Any thoughts?

 

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