Building a Aikido preamplifier - Page 52

john65b · 10:06 PM

Quote:

There is a high gain section #2 in the 6U10 which could be used as the input tube once plate resistor and cathode resistor values were changed. Sections 1 and three would be used in place of the 12AU7.

OK, I remember that schematic. Are there other triple triodes out there. preferably a triple 6SN7? Any quadruple triodes?

Cobra2 · 2nd January 2012, 08:35 AM

Compactron Tubes: A Junkbox Guide

Arne K

Original Burnedfingers · 10:58 AM

There is no compactron 6sn7 ever made.

Aikido Tube Amplifiers different Aikido varieties

john65b · 2nd January 2012, 01:16 PM

Hmmm, a 6C10 is a triple 12AX7...it would make for an interesting two tube Jadis JP200 preamp...

dvh99 · 23rd January 2012, 08:08 AM

here is my aikido finally finished and feeling at home in a for what i think a nice cherry wood housing.
4*6sn7 2*250v w ct 38v drop across r17 (1500ohm) and janus shunt.

it is dead quiet with the pcb ground tied directly to earth from iec inlet.
the sound in combination with the moskido is magic, i have yet to hear a better combo and that is without burning in of the tubes of the aikido.

pics,

CoolJazz · 24th January 2012, 05:34 PM

You used a choke with the Janus? Care to explain how you wired it in there?
Did you hear the amp without the choke? If you did, dus it make any difference?

Cj

migkiller1971 · 24th January 2012, 06:04 PM

Quote:

Originally Posted by CoolJazz

You used a choke with the Janus? Care to explain how you wired it in there?
Did you hear the amp without the choke? If you did, dus it make any difference?

Cj

Bump!!! I might be wrong but you would repace R17 with a Choke? I have no idea how to calculate what size Choke you would need.

I have the same Octal Linestage and His looks like a Beast compared to mine.

dvh99 · 24th January 2012, 06:41 PM

there is no choke in here.

i like a bit of room in my amp

plus i had plenty of wood.
salvaged a cherrywood cabinet for the amp.

CoolJazz · 24th January 2012, 06:46 PM

Then the obvious question is what is the transformer thingy on the lower left in your picture, and the square box above it?

dvh99 · 24th January 2012, 06:51 PM

the 5vac transformer for the rectifier and the thingy above it is a 9vac transformer for the softstart circuit for the overkill 250v-250v ct 500VA transformer

.
the transformer in the left upper corner is a 8vac 80VA i think hammond for the filaments.

2nd January 2012, 08:35 AM	#512
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	Compactron Tubes: A Junkbox Guide Arne K __________________ Ars longa, vita brevis

2nd January 2012, 10:52 AM	#513
Original Burnedfingers diyAudio Member Join Date: Nov 2002	There is no compactron 6sn7 ever made. Aikido Tube Amplifiers different Aikido varieties Last edited by Original Burnedfingers; 2nd January 2012 at 10:58 AM.

2nd January 2012, 01:16 PM	#514
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	Hmmm, a 6C10 is a triple 12AX7...it would make for an interesting two tube Jadis JP200 preamp... __________________ All right, but apart from the sanitation, medicine, education, wine, public order, irrigation, roads, the fresh water system and public health, what have the Romans ever done for us? Life of Brian

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23rd January 2012, 08:08 AM	#515
dvh99 diyAudio Member Join Date: Sep 2010	here is my aikido finally finished and feeling at home in a for what i think a nice cherry wood housing. 46sn7 2250v w ct 38v drop across r17 (1500ohm) and janus shunt. it is dead quiet with the pcb ground tied directly to earth from iec inlet. the sound in combination with the moskido is magic, i have yet to hear a better combo and that is without burning in of the tubes of the aikido. pics,

24th January 2012, 05:34 PM	#516
CoolJazz diyAudio Member Join Date: Dec 2009 Location: Utrecht	You used a choke with the Janus? Care to explain how you wired it in there? Did you hear the amp without the choke? If you did, dus it make any difference? Cj

24th January 2012, 06:41 PM	#518
dvh99 diyAudio Member Join Date: Sep 2010	there is no choke in here. i like a bit of room in my amp plus i had plenty of wood. salvaged a cherrywood cabinet for the amp.

24th January 2012, 06:46 PM	#519
CoolJazz diyAudio Member Join Date: Dec 2009 Location: Utrecht	Then the obvious question is what is the transformer thingy on the lower left in your picture, and the square box above it?

24th January 2012, 06:51 PM	#520
dvh99 diyAudio Member Join Date: Sep 2010	the 5vac transformer for the rectifier and the thingy above it is a 9vac transformer for the softstart circuit for the overkill 250v-250v ct 500VA transformer . the transformer in the left upper corner is a 8vac 80VA i think hammond for the filaments.

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