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-   -   Another linestage...... (http://www.diyaudio.com/forums/tubes-valves/59772-another-linestage.html)

kianbach 26th June 2005 03:41 PM

Another linestage......
 
2 Attachment(s)
Will THIS work and if not why not?

SY 26th June 2005 03:52 PM

The plate of the first stage is at AC ground.

kianbach 26th June 2005 04:01 PM

Explain please I'm a newbie

moamps 26th June 2005 04:58 PM

Quote:

Originally posted by kianbach
Explain please I'm a newbie
The anode resistor on the input tube is missing.

Regards,
Milan

kianbach 26th June 2005 06:01 PM

What sort of value should I use?

Is there a formula to work it out apart from Ohm's law for dropping voltage?

I've got some 6k8 and 10k resistors.Would either of these do?

SY 26th June 2005 06:36 PM

I don't mean to be rude, but you're asking a lot of questions about arrows and you haven't yet defined the target. What are you trying to accomplish? Gain, source Z, load, distortion, signal-to-noise...?

kianbach 26th June 2005 06:52 PM

Well,I've got an SRPP 6SN7 linestage atm and am looking for more gain and/or a different sound.A few months ago I tried Joel's 12AY7/6SN7 circuit but with ecc81 and 6N7 and liked the sound of it but was thinking of having 1/2 the B+ for the 1st stage and direct-coupling between stages,hence this sorry attempt at designing my own.I was hoping someone could point me in the right direction,I need to drive a SRPP 6SN7/2A3 SE power amp.

moamps 26th June 2005 08:10 PM

Quote:

Originally posted by kianbach
..... I tried Joel's 12AY7/6SN7 circuit but with ecc81 and 6N7 and liked the sound of it but was thinking of having 1/2 the B+ for the 1st stage and direct-coupling between stages.....I need to drive a SRPP 6SN7/2A3 SE power amp..
Hi,

Use 300V B+ for ECC85 (omit OA2 and 0.1uF),
Va=150V, Ia=10mA, Vgc=-1V,
then
Rc=Vgc/Ia=100ohm (in your schematic 390ohm),
Ra=(Vcc-Va)/Ia=150/0,01=15kohm (dropper in your schematic).

Regards,
Milan

kianbach 26th June 2005 09:29 PM

Thanks for your help.Will the second stage be OK as is or do I need to change anything?

kianbach 28th June 2005 01:11 PM

Well it's built and running!Sounds nice,plenty of gain,Drives my 2A3SE no probs.Ear bleeding volume from my Lowther Acoustas.
Values as follows::

B+ 300v
Ecc85 anode R = 15k
Ecc85 cathode R = 220r
6N7 cathode R = 23.5k(47k x 2)

total current draw 25mA from a 100mA tranny.

NICE!:)
Will post Picks soon but it looks rough as it's on my experimantal/Frankenstein chassis.


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