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Old 29th January 2008, 06:47 PM   #1601
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by carpenter
Well, since we're talking preamps--and a total newbie, me--I want simple; point to point is fine.

I'll like Choky's, but need some values to play with. Does it need an output transformer?:

can you give me few days , to give you exact schematic ?


I'm asking again - which gain and which output impedance you need ?


that's dreky SUSY , with all possible in/out combinations .......... but you already know that
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Old 29th January 2008, 06:56 PM   #1602
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I think I like Choky's better. The last drawing just offers me an idea of what component values I might be expected to use.
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Old 29th January 2008, 06:58 PM   #1603
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Quote:
Originally posted by Zen Mod



can you give me few days , to give you exact schematic ?


I'm asking again - which gain and which output impedance you need ?


that's dreky SUSY , with all possible in/out combinations .......... but you already know that

A gain of 10 or 12 would be nice. I'll be using this unit to drive my F4s.
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Old 29th January 2008, 07:13 PM   #1604
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How about a SUSY version to mate w/ an F3? Thanks. James
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Old 29th January 2008, 09:00 PM   #1605
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Quote:
Originally posted by carpenter



A gain of 10 or 12 would be nice. I'll be using this unit to drive my F4s.

I should be more specific: I'm using these to drive my F4s that are driving my high-frequency horns!!! I don't require much wattage to do that....
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Old 29th January 2008, 09:37 PM   #1606
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I have a discarded Fisher 500C collecting dust in the garage. Is it a good source for plundering, or should I just rebuild/replace old components?
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Old 29th January 2008, 10:07 PM   #1607
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Quote:
Originally posted by carpenter



I should be more specific: I'm using these to drive my F4s that are driving my high-frequency horns!!! I don't require much wattage to do that....


in that case you don't need more than 5x gain .......

for mini F4?

so - if ya agree - that's job for 6DJ8 , on your side of big splash ;
on my side that's job for ECC88 ; decent Ri, decent S , appropriate Mu
sand CCSink in tail, split choke as anode load ......... ups- wrong forum - Sand CCSource(s) on top of each anode .........

with closed FB loop enough decent output imp. - in any case much less than 1K



Quote:
Originally posted by carpenter
I have a discarded Fisher 500C collecting dust in the garage. Is it a good source for plundering, or should I just rebuild/replace old components?

well - it is discarded ....... full of unnecessary drek ......

send these worthless OPTs to me - ya know ...... proper disposal etc ......

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Old 29th January 2008, 10:17 PM   #1608
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Quote:
Originally posted by carpenter
I dug this little guy out of my bookmarks. What do you think?

Well, it has a relatively high output impeadance. It is ussually easy enough to get down to a few hundred ohms with a tube follower output, without an XFMR. It only uses "RC" loading/coupling, ussually loosing some linearity. A choke loaded
idea might be better. Or maybe an SRPP. I'm planning on pairing an Aikido with an F4 type circuit sans the JFETs

Oh Yea, it says modified for Hi-Fi use??? Just reminds me of a Guitar input designed to be "overdriven" to Jimi Hendrix land. Or is that this side of a short
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Old 29th January 2008, 10:40 PM   #1609
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Originally posted by flg



Well, it has a relatively high output impeadance. It is ussually easy enough to get down to a few hundred ohms with a tube follower output, without an XFMR. It only uses "RC" loading/coupling, ussually loosing some linearity. A choke loaded
idea might be better. Or maybe an SRPP. I'm planning on pairing an Aikido with an F4 type circuit sans the JFETs

Oh Yea, it says modified for Hi-Fi use??? Just reminds me of a Guitar input designed to be "overdriven" to Jimi Hendrix land. Or is that this side of a short

Originally, it was a guitar preamp. I'm sticking with Choky's ideas!
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Old 29th January 2008, 10:49 PM   #1610
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Quote:
Originally posted by Zen Mod




in that case you don't need more than 5x gain .......

for mini F4?

so - if ya agree - that's job for 6DJ8 , on your side of big splash ;
on my side that's job for ECC88 ; decent Ri, decent S , appropriate Mu
sand CCSink in tail, split choke as anode load ......... ups- wrong forum - Sand CCSource(s) on top of each anode .........

with closed FB loop enough decent output imp. - in any case much less than 1K ...

...well - it is discarded ....... full of unnecessary drek ......

send these worthless OPTs to me - ya know ...... proper disposal etc ......

Fisher unit receives much praise on the Internet.... humm, maybe I should rebuild it as originally planned so many, many years ago. Unfortunately, Nelson's designs are so much fun that I never get around to tubes.

And then there's the Pumpkin.......

Perhaps now is the time for a tube pre, yes? I'll go with your ideas, Choky.

Radiotron Designer's Handbook 4th addition: Credit was given to a fellow named Choky for it's attainment. I wondered if this fellow is you...
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