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Old 8th September 2012, 08:01 PM   #21
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Quote:
Originally Posted by merlin el mago View Post
thanks for schematic:

input/output impedance?
gain?
if I don't use DN2450, how much current & voltage have to set my regulator?
Irrelevant questions: the amp is inverting. You need non-inverting. That means, you need to go with 2 stages and feedback around them defining voltage gain.
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Old 8th September 2012, 08:03 PM   #22
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Quote:
Originally Posted by Wavebourn View Post
The only concrete requirement is "Non-inverting", the rest is undefined. You have to put numbers for each criterion.

-high gain -- how much? x60 35,6dBs
-low output impedance --lower than...? few hundred ohms between 120-200R
-high input impedance --higher than...? 1meg
-non-inverting
-low distortion --what kind of distortions..., which level...? THD, low as possible
-flat frecuency response --how many DB in which band?20-20kHz flat as possible 0,xx
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Old 8th September 2012, 08:06 PM   #23
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all your questions are redundant

regulator is not having any connection with "if I don't use DN2540"

in this case , Iq of stage is set with DN2540 at 5mA , so Salas reg must nbe set at at least 10mA , twice that even better

anyway - if you're going to use proper shunt reg - taking in account that reg itself demands some space , then use proper tube ....... with lower Ri , greater xconductance

I don't like sissy tubes

6Н23П (ECC88=6DJ8) is weakest tube I'll use in line stage
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Old 8th September 2012, 08:07 PM   #24
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Zen could you share the schematic you use in your line stage?
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Old 8th September 2012, 08:07 PM   #25
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regarding #22

so - 3 stages - two gain stages , cascaded , with cathode follower

look for any of Allen Wright's SE line stage constructions

edit : didn't saw x60 ......

in that case AW constructions aren't helpful ......
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Last edited by Zen Mod; 8th September 2012 at 08:11 PM.
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Old 8th September 2012, 08:09 PM   #26
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Quote:
Originally Posted by merlin el mago View Post
Zen could you share the schematic you use in your line stage?
made several .....

none in this moment - AVC even without buffers

planning to try soon some balanced bstrd with xformer output

if works as planned , will post
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Old 8th September 2012, 08:11 PM   #27
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Old 8th September 2012, 08:13 PM   #28
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If design & sound is good can low the gain to x30 or x40
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Old 8th September 2012, 08:51 PM   #29
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Here is something that fulfils your specification. Performance is mentioned in the schematic again.
(You can omit R14)

Would this be OK ?

Click the image to open in full size.


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Old 8th September 2012, 09:12 PM   #30
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Yes

Needs a special heater wiring, wich heaters requirements, volts & ampers?

Last edited by merlin el mago; 8th September 2012 at 09:15 PM.
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