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Senior Member
Username: pierreyves

Post Number: 626
Registered: 11-2006
Posted on Sunday, July 04, 2010 - 3:06 am:   Edit Post

Hi everybody, could you confirm if this tube is well for F1-X?
best regards
Username: bassclef29

Post Number: 17
Registered: 5-2006
Posted on Friday, July 09, 2010 - 2:40 pm:   Edit Post


I have a JJ ECC83 in my F1-X. Recently, looking for a higher-gain tube, I made an inquiry to a reputable company called Eurotubes (http://eurotubes.com/).

They recommended the JJ ECC803 and assured me it would fit within the same metal sleeve as the ECC83. But I do not have personal experience with the tube, so I cannot be certain.

Hope this helps.
--Joe in San Diego, California, USA
Intermediate Member
Username: xlrogue6

Post Number: 170
Registered: 8-2002
Posted on Friday, July 09, 2010 - 2:57 pm:   Edit Post

JJ ECC83s are one of the smaller diameter current production 12AX7/7025/ECC83 tubes. Electro Harmonics, TungSols, and Mullard reissues will probably be too large to fit inside the shield on an F1-X. Just tried all of these in a 70's Marshall with small diameter shield bases and the JJs were the only ones that fit. I highly recommend getting the Ruby tested 12AX7HG+, which is Ruby's nomenclature for the highest gain/lowest microphonics JJs out of the large batches they get.
Senior Member
Username: pierreyves

Post Number: 629
Registered: 11-2006
Posted on Saturday, July 10, 2010 - 12:15 am:   Edit Post

But they are ECC 803, not ECC83 ? Possible to compare size of your tubes ? Sorry, I don't have "pied coulisse":
:-) Thank's
Advanced Member
Username: rraymond

Post Number: 375
Registered: 6-2002
Posted on Saturday, July 10, 2010 - 2:00 pm:   Edit Post

How about some data sheets for JJ tubes:



Hope this helps!

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