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Tube DIY Asylum: still doesn't work by Joelt Do It Yourself (DIY) paradise for tube and SET project builders. |
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208.255.103.2
In Reply to: Why not ??? posted by lampa on November 18, 2003 at 14:32:41:
> > The 417A biased at 6V with 1:2 step-up input trafo will smoke out any two stage driver section for sure.> >Are you sure Joe? Step up transformers aren't known for their low distortion. Let's look at the 417A: "typical operation" is Eb 150v, Ib 26mA, and Ec -1.6v, mu 43...
Assuming we can find a step up interstage that can handle 26mA of dc, we get a 43v pk-pk swing out of the 417a, stepped up to 86v. We're still under our target of 94v pk-pk, and we've swung our driver tube's grid through 62% of its bias... not good.Joel
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Topic - Input/driver for 2A3 parafeed - Tubefever 09:05:39 11/17/03 ( 57)
- Re: Input/driver for 2A3 parafeed - keto 15:15:33 11/19/03 ( 0)
Re: Input/driver for 2A3 parafeed - Sector-7G 14:07:03 11/19/03 ( 0)
Re: Input/driver for 2A3 parafeed - C.Y 01:43:05 11/19/03 ( 0)
Re: Input/driver for 2A3 parafeed - Hifitom 14:02:32 11/17/03 ( 45)
- Re: Input/driver for 2A3 parafeed - Joelt 18:36:06 11/17/03 ( 0)
Re: Input/driver for 2A3 parafeed - kurt s 14:19:53 11/17/03 ( 43)
- Re: Input/driver for 2A3 parafeed - dave slagle 07:46:29 11/19/03 ( 0)
ECC99 sounds great! - AudioGenesis 18:26:59 11/17/03 ( 40)
- Hi Robert - Anthony Dockrill 22:32:32 11/18/03 ( 0)
Re: ECC99 sounds great! - kurt s 21:34:33 11/17/03 ( 0)
One stage is not enough. - Joelt 19:01:02 11/17/03 ( 37)
- Re: One stage is not enough. - MQracing 11:21:19 11/18/03 ( 1)
- Re: Recommendations for 2 stages - Tubefever 11:56:30 11/18/03 ( 0)
Re: One stage is not enough. - Dave Cigna 10:35:50 11/18/03 ( 32)
- rated power - Joelt 11:28:29 11/18/03 ( 31)
- Re: rated power ... and CD players - Paul Joppa 20:32:09 11/18/03 ( 22)
- Re: rated power ... and CD players - Joelt 06:47:38 11/19/03 ( 21)
- Re: rated power ... and CD players - Damir 12:17:13 11/19/03 ( 2)
- Re: rated power ... and CD players - dave slagle 19:09:34 11/19/03 ( 1)
- Re: rated power ... and CD players - Joelt 20:37:51 11/19/03 ( 0)
- Re: rated power ... and CD players - Dave Cigna 10:13:17 11/19/03 ( 4)
- oh brother... - Joelt 11:15:03 11/19/03 ( 3)
- Re: oh brother... - MQracing 16:35:33 11/19/03 ( 1)
- if we're being honest... - Dave Cigna 17:15:02 11/19/03 ( 0)
- oh brother is right! - Dave Cigna 14:33:53 11/19/03 ( 0)
- Re: rated power ... and CD players - dave slagle 07:34:36 11/19/03 ( 12)
- How will *your* amp do in *my* house? - Joelt 08:04:08 11/19/03 ( 11)
- Re: How will *your* amp do in *my* house? - dave slagle 09:23:20 11/19/03 ( 10)
- Re: How will *your* amp do in *my* house? - MQracing 16:47:26 11/19/03 ( 8)
- Re: How will *your* amp do in *my* house? - dave slagle 19:46:38 11/19/03 ( 7)
- an' teach him to fish, an' he'll sit on the bank and drink beer all day. - Sector-7G 19:58:27 11/19/03 ( 6)
- Re: an' teach him to fish, an' he'll sit on the bank and drink beer all day. - dave slagle 20:19:23 11/19/03 ( 5)
- Quit trolling, guys! [nt] - J Epstein 10:07:17 11/20/03 ( 3)
- Dave Slagle and Dave Cigna trolls?.................... - Snake Anthony. 15:22:04 11/20/03 ( 2)
- It's true! - Dave Cigna 16:09:18 11/20/03 ( 1)
- DUMBO - J Epstein 07:38:37 11/21/03 ( 0)
- Re: an' teach him to fish, an' he'll sit on the bank and drink beer all day. - lampa 21:23:43 11/19/03 ( 0)
- please contribute something *useful* for god's sake - Joelt 09:52:18 11/19/03 ( 0)
My mistake.... - Dave Cigna 15:52:11 11/18/03 ( 0)
Why not ??? - lampa 14:32:41 11/18/03 ( 5)
- still doesn't work - Joelt 11/19/03 07:09:30 11/19/03 ( 3)
- Re: still doesn't work - lampa 11:31:53 11/19/03 ( 2)
- Re: still doesn't work - Joelt 11:49:46 11/19/03 ( 1)
- Re: still doesn't work - lampa 12:08:13 11/19/03 ( 0)
Re: Why not ??? - AudioGenesis 17:29:18 11/18/03 ( 0)
Re: Does SRPP count as one stage or two? (nt) - Tubefever 14:23:23 11/18/03 ( 0)
Re: One stage is (not) enough. - Damir 06:33:50 11/18/03 ( 1)
- Re: One stage is (not) enough. - Joelt 06:55:11 11/18/03 ( 0)
Re: Input/driver for 2A3 parafeed - Hifitom 16:06:24 11/17/03 ( 0)
try 5965, 6N1p, 12AZ7 - TubeCraft 13:45:27 11/17/03 ( 0)
12AY7 is a classic (nt) - Paul Joppa 09:34:23 11/17/03 ( 3)
- Re: What confuguration for 12AY7? (nt) - Tubefever 12:48:16 11/17/03 ( 2)
- SRPP - Alan Breece 18:18:53 11/17/03 ( 1)
- Re: Thanks (nt) - Tubefever 11:58:36 11/18/03 ( 0)
Re: Input/driver for 2A3 parafeed - Joelt 09:28:02 11/17/03 ( 2)
- what schematic software do you use? beautiful <nt> - Mqracing 17:17:15 11/19/03 ( 1)
- Re: what schematic software do you use? beautiful <nt> - Joelt 20:21:24 11/19/03 ( 0)
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