preamp tubes change

mongiak · 18th August 2005, 07:07 PM

I´ll like to know if I can change the preamp tubes of my amp without doing any chage in the schematic. The amp uses the ecc83 and I gould like to try the ecc82.

thanks a lot

SY · 18th August 2005, 07:39 PM

These two tubes are very, very different.

leadbelly · 18th August 2005, 08:34 PM

This is an excellent and easy swap as long as you never plan to turn on the preamp again. A more challenging swap to octal tubes will require a mallet and duct tape.

Or you could play it safe at look for another substitution here:

http://tdsl.duncanamps.com/show.php?des=ECC83

mongiak · 19th August 2005, 05:44 PM

I´ve been reading arround and many peoples say that the change can be done, in a expert page it´s said that the change can be done but that it doesn´t allays work.

Substitutions:
* means appropriate for parallel filament circuits
# means may not work in all circuits
Preamp and driver tube substitutions:

12AX7 (high gain dual triodes with pinout 9A)
12AD7* 12DT7 7729
12AU7# 5751* B339
12AU7A# 5751WA* B759
12AX7 6057 CV4004
12AX7A 6681 E83CC
12AX7WA 6L13 ECC803
12BZ7* 7025 ECC83
12DF7 7025A M8137
12DM7* 7494

18th August 2005, 07:07 PM	#1
mongiak diyAudio Member Join Date: Oct 2004	preamp tubes change I´ll like to know if I can change the preamp tubes of my amp without doing any chage in the schematic. The amp uses the ecc83 and I gould like to try the ecc82. thanks a lot

18th August 2005, 07:39 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	These two tubes are very, very different. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

18th August 2005, 08:34 PM	#3
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	This is an excellent and easy swap as long as you never plan to turn on the preamp again. A more challenging swap to octal tubes will require a mallet and duct tape. Or you could play it safe at look for another substitution here: http://tdsl.duncanamps.com/show.php?des=ECC83 __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

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19th August 2005, 05:44 PM	#4
mongiak diyAudio Member Join Date: Oct 2004	I´ve been reading arround and many peoples say that the change can be done, in a expert page it´s said that the change can be done but that it doesn´t allays work. Substitutions: * means appropriate for parallel filament circuits # means may not work in all circuits Preamp and driver tube substitutions: 12AX7 (high gain dual triodes with pinout 9A) 12AD7* 12DT7 7729 12AU7# 5751* B339 12AU7A# 5751WA* B759 12AX7 6057 CV4004 12AX7A 6681 E83CC 12AX7WA 6L13 ECC803 12BZ7* 7025 ECC83 12DF7 7025A M8137 12DM7* 7494

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