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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: What sounds 'god sent'............ posted by Neff on August 28, 2012 at 17:27:22:
"So, individuals should suggest what they prefer..."I'll take you up on that. Just a personal view of the sound that works for me, which has been worked out over several years through trial and error and the advice and ideas of several creative asylum seekers, looking to cross the frontier to paradise.
Three things transformed my own 300b SET system:
1. Directly heated triodes for ALL tubes, not just outputs. This was a huge step forwards - at last I got all the delicacy, instrumental timbre and transparency I was seeking. Tubes like 10Y, 46, 26, 4P1L are levels above any indirectly heated tubes. Yes, you need them in all the line/input stages, not just the outputs.
2. Filament bias. This all came out of the 26 preamp project, which is a huge thread on DIY Audio called "26 pre amp". It works beautifully for tubes like the 26 and 4P1L (in triode) and has now become the preferred biasing method for the latest generation of 26 preamps. It works great for the 4P1L as a driver stage, and I now use 4P1L as the input tube as well.
3. Transformer coupling all the way through. Expensive, but does away with caps, plate resistors, grid chokes and all the rest. With three stages you need two interstages - I'm using LL1660/18mA and Hammond 126C for the input and driver stages, both 4P1L in filament bias.
I hate bypassed cathode resistors, and am trying to summon up the courage to use filament bias to replace the bypassed 1K resistor on the 300b. That's a bit nuts, if you do the calculations. Something like a 50 ohm cathode resistor at 200 watts. It's not impossible....
I'd just like to end by saying that ALL the advances I ever made were through collaboration. Without the generosity of spirit of fellow builders and forums like this none of it would have been possible. We learn and learn.
Andy
Edits: 08/29/12
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Follow Ups
- Filament bias and DHTs transformed my system. - andy evans 23:57:34 08/28/12 (37)
- Have you tried this approach on 300B PP? - Frihed89 23:07:10 08/30/12 (0)
- RE: Filament bias and DHTs transformed my system. - coffee-phil 12:45:10 08/29/12 (15)
- RE: There is no mystery - amnesiac 02:46:19 09/08/12 (0)
- Why do DHTs sound better? - andy evans 13:18:23 08/29/12 (13)
- - Triode_Kingdom 08:24:50 08/30/12 (0)
- RE: Why do DHTs sound better? - coffee-phil 14:13:31 08/29/12 (11)
- RE: Why do DHTs sound better? - dave slagle 15:56:04 08/29/12 (1)
- RE: Why do DHTs sound better? - coffee-phil 18:56:36 08/29/12 (0)
- Nice try ;-) - Chris O 14:50:13 08/29/12 (8)
- RE: Nice try ;-) - dave slagle 18:00:24 08/29/12 (6)
- "What does this tell you?" - Chris O 08:07:52 08/30/12 (5)
- RE: "What does this tell you?" - dave slagle 08:47:20 08/30/12 (4)
- RE: "What does this tell you?" - Chris O 12:58:46 08/30/12 (3)
- RE: "What does this tell you?" - dave slagle 13:43:18 08/30/12 (2)
- RE: "What does this tell you?" - coffee-phil 08:38:50 09/08/12 (0)
- Then I guess you convinced me. (nt) - Chris O 14:24:55 08/30/12 (0)
- RE: Nice try ;-) - coffee-phil 16:04:33 08/29/12 (0)
- RE: Filament bias and DHTs transformed my system. - amnesiac 08:31:50 08/29/12 (4)
- Spot on for the most part, sadly. nt - Stephen R 11:49:10 08/29/12 (0)
- You have a great sense of humour! - andy evans 08:56:05 08/29/12 (2)
- RE: KOSS headphone billboard in Milwaukee - bean 14:16:51 08/29/12 (0)
- RE: You have a great sense of humor! - amnesiac 09:34:56 08/29/12 (0)
- "I hate bypassed cathode resistors" Wouldn't a better way to say this: "I love local feedback!" ;-) - Chris O 08:12:42 08/29/12 (1)
- Like Wagner's Ring Cycle.... - andy evans 08:21:40 08/29/12 (0)
- RE: Filament bias and DHTs transformed my system. - tube wrangler 01:04:03 08/29/12 (8)
- cathode resistor - Tre' 08:01:44 08/29/12 (3)
- RE: cathode resistor - Cleantimestream 08:37:16 08/29/12 (2)
- RE: cathode resistor - andy evans 09:46:06 08/29/12 (1)
- RE: cathode resistor - Cleantimestream 12:45:38 08/29/12 (0)
- How to build a "least bad" system! - andy evans 01:21:48 08/29/12 (3)
- RE: How to build a "least bad" system! - Tre' 13:48:03 08/30/12 (1)
- Two words - Glow Ultrapath!! - andy evans 23:24:54 08/30/12 (0)
- RE: How to build a "least bad" system! - drlowmu 06:47:28 08/29/12 (0)
- RE: Filament bias and DHTs transformed my system. - amnesiac 00:47:21 08/29/12 (3)
- Audio autism... I don't own any Philip Glass records...~nT - Cleantimestream 09:06:18 08/29/12 (0)
- RE: "audio Autism" - 1973shovel 05:32:39 08/29/12 (0)
- Systems.... - andy evans 01:05:20 08/29/12 (0)
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