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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Try this one posted by serus on September 28, 2004 at 22:06:58:
Hello ,
There must be far better ways of modifying these amps , what does this mod sound like ? 47k loads on the concertina , driving 0.1uF caps into 100k grid stoppers , with output stage strapped as triodes ? What comes to mind is a subjective rolloff at both the frequency extremes . I have played around with concertinas quite a bit and valves such as 12AT7/12AU7 and 12AX7 just don't cut it , low Ra valves such as 5687 / ECC99 / 6H30 are far superior sonically and with the measured results . Fair enough using a 12AT7 front end (not really a fave of mine) but it's not really a suitable valve for concertina usage , I would imagine a 10kHz square wave would look almost like a sine wave . $60 could be better pressed into service with a 6GK5 or better still 6072 input stage and 12B4A concertina or a 6EM7 rather than a 12AT7 . Better still Allen Wright's PP1C cascode driver stage , superb sounding , stable , with tons of gain .cheers
...FB
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Follow Ups
- Questionable - fatbottle 08:02:12 09/29/04 (30)
- I challenge you to publish your measurents of that rolloff! - serus 12:03:12 09/29/04 (23)
- Re: I challenge you to publish your measurents of that rolloff! - fatbottle 01:40:41 09/30/04 (9)
- Your guess is wrong and you are evidently NOT an authority on the subject - serus 08:51:50 09/30/04 (8)
- Who said I was an authority on the subject , just informing of past findings(nt) - fatbottle 09:48:37 09/30/04 (0)
- Oh dear , I've upset him - fatbottle 09:45:26 09/30/04 (6)
- Not really, just pointing out your empty claims - serus 12:06:28 09/30/04 (5)
- Sorry , methinks you're pulling my chain - fatbottle 13:12:22 09/30/04 (4)
- Quite frankly I expected you to say that you don't believe... - serus 14:47:55 09/30/04 (3)
- Re: Quite frankly I expected you to say that you don't believe... - fatbottle 15:04:12 09/30/04 (2)
- Let it go, my friend... - serus 15:40:22 09/30/04 (1)
- Scope ? - fatbottle 02:25:17 10/04/04 (0)
- Re: I challenge you to publish your measurents of that rolloff! - Sector-7G 17:01:10 09/29/04 (12)
- Now we are talking... - serus 19:30:31 09/29/04 (11)
- Re: Now we are talking... - Sector-7G 19:59:37 09/29/04 (10)
- Diff amp balanced? - serus 22:39:16 09/29/04 (3)
- Re: Diff amp balanced? - Sector-7G 06:12:44 09/30/04 (2)
- Re: Diff amp balanced? - serus 08:14:31 09/30/04 (1)
- Re: Diff amp balanced? - Sector-7G 19:38:48 10/01/04 (0)
- My measurements - serus 21:47:59 09/29/04 (5)
- Re: My measurements - Sector-7G 06:37:54 09/30/04 (4)
- Re: freq response - serus 07:45:18 09/30/04 (3)
- Re: freq response - Sector-7G 08:17:47 09/30/04 (2)
- Re: freq response - serus 09:01:11 09/30/04 (1)
- so get a bigger hammer... - Sector-7G 09:15:08 10/02/04 (0)
- Re: Questionable - rickl 11:48:30 09/29/04 (5)
- Re: Questionable - fatbottle 12:10:56 09/29/04 (4)
- Re: Questionable - rickl 14:10:24 09/29/04 (3)
- Not questionable at all... - serus 15:02:28 09/29/04 (2)
- Re: Not questionable at all... - rickl 20:54:59 09/29/04 (1)
- Preamp - serus 21:54:34 09/29/04 (0)
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