Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: kagliostro on March 12, 2015, 11:38:31 am

Title: Tube substitute
Post by: kagliostro on March 12, 2015, 11:38:31 am

The original schematic used a 6j6 tube as paraphase PI

(http://www.bensykora.com/7cylinder/7cylinder_final.gif)

my friend buid a 9 pin version of the amp using a 12ay7 as substitute for the 6j6 tube (near same gain)

http://www.mif.pg.gda.pl/homepages/frank/short/001/6/6J6.gif (http://www.mif.pg.gda.pl/homepages/frank/short/001/6/6J6.gif)

http://www.mif.pg.gda.pl/homepages/frank/short/001/1/12AY7.gif (http://www.mif.pg.gda.pl/homepages/frank/short/001/1/12AY7.gif)

I'm planning to build my version of the amp and I would like to know

if I can use 6N2P tube (that is close to 12ax7) as substitute for the 6j6 PI

http://www.mif.pg.gda.pl/homepages/frank/sheets/112/6/6N2PEV.pdf (http://www.mif.pg.gda.pl/homepages/frank/sheets/112/6/6N2PEV.pdf)

whithout changes on the component values

Many Thanks

K

Title: Re: Tube substitute
Post by: PRR on March 12, 2015, 12:06:40 pm

Yes.

Title: Re: Tube substitute
Post by: kagliostro on March 12, 2015, 01:10:48 pm

Thank you Sir (http://www.diyitalia.eu/forum/images/smilies/salutations-489.gif)

Franco