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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Hi,
At one time I decided to build a Velleman Kit (K7203) to use a a regulated filament supply, also giving me the possibility to adjust the filament voltage easily over a wide range (to use different tubes).
I use 4, one each for the VT25 drivers and 300B finals.
It works splendidly, but I want to hear your opinion of this implementation vs a Coleman Regulator. Although noise performance is super and it all sounds great, I'm not sure this implementation addresses the following problem as addressed by Ron:
"The 5,0V filament carries filament dc voltage but also the anode-current Ia. At the 2 ends of the filament there is a 5V difference caused by the heating voltage - and this makes a current-flow across the filament of MUSIC-signal! This is because the gm of the triode is different at the +5V end compared to the 0V end.
This is normal, it is natural.
But when you connect a voltage regulator, the feedback action of the LT1084 will try to CORRECT the Music signal flowing in the filament. The regulator thinks the music-signal is an error! so you get a bad situation where the LT1084 is trying to compensate for the Music. This is the reason why the voltage-regulator desreves its BAD reputation for making bad sound.
"
Is this feedback/correction problem present in the regulator I use?
Thanks,
NC
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Topic - Is this regulated filament supply any good? - Nickel Core 01:28:16 10/25/14 (37)
- Just use Rod Coleman's regulators - andy evans 01:47:53 10/27/14 (5)
- RE: Just use Rod Coleman's regulators - Al Noakes 10:51:36 10/27/14 (0)
- RE: Just use Rod Coleman's regulators - Alex Kitic 04:10:27 10/27/14 (0)
- Where to order? - Nickel Core 02:42:34 10/27/14 (2)
- RE: Where to order? - andy evans 07:47:07 10/27/14 (1)
- RE: Where to order? - Triode_Kingdom 20:33:35 10/27/14 (0)
- No - Triode_Kingdom 06:58:52 10/26/14 (17)
- So... - Nickel Core 07:04:30 10/26/14 (16)
- RE: So... - Triode_Kingdom 10:42:26 10/26/14 (15)
- RE: So... - Nickel Core 11:28:36 10/26/14 (14)
- RE: So... - Alex Kitic 13:54:17 10/26/14 (13)
- Alex... - Triode_Kingdom 18:23:28 10/26/14 (12)
- RE: Alex... - Alex Kitic 22:31:13 10/26/14 (11)
- RE: Alex... - Lew 10:02:57 10/27/14 (0)
- RE: Alex... - Alex Kitic 03:46:46 10/27/14 (9)
- RE: Alex... - Triode_Kingdom 08:53:24 10/27/14 (8)
- RE: Alex... - Alex Kitic 11:42:41 10/27/14 (7)
- RE: Alex... - Al Noakes 12:50:27 10/27/14 (6)
- RE: Alex... - Alex Kitic 13:07:58 10/27/14 (5)
- RE: Alex... - Al Noakes 14:25:07 10/27/14 (4)
- RE: Alex... - Alex Kitic 22:23:27 10/27/14 (2)
- RE: Alex... - Triode_Kingdom 07:29:20 10/28/14 (1)
- RE: Alex... - Alex Kitic 14:18:43 10/28/14 (0)
- 10A Transformer - Triode_Kingdom 20:28:08 10/27/14 (0)
- RE: Is this regulated filament supply any good? - Caucasian Blackplate 17:22:12 10/25/14 (2)
- RE: Is this regulated filament supply any good? - Alex Kitic 04:25:44 10/26/14 (1)
- But... - Nickel Core 05:01:47 10/26/14 (0)
- RE: Is this regulated filament supply any good? - Al Noakes 05:51:33 10/25/14 (4)
- RE:maybe mod these Ask TK - amnesiac 06:03:47 10/25/14 (3)
- RE:maybe mod these Ask TK - Alex Kitic 10:11:06 10/25/14 (2)
- RE:maybe mod these Ask TK - amnesiac 07:56:59 10/26/14 (0)
- Yes... - Nickel Core 04:12:03 10/26/14 (0)
- RE: Is this regulated filament supply any good? - Alex Kitic 05:45:11 10/25/14 (4)
- RE: Is this regulated filament supply any good? - Tre' 07:49:00 10/25/14 (3)
- AC/DC - Triode_Kingdom 11:21:57 10/25/14 (0)
- RE: Is this regulated filament supply any good? - Alex Kitic 09:55:48 10/25/14 (1)
- RE: Is this regulated filament supply any good? - Tre' 13:37:54 10/25/14 (0)
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