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FDP Forum / Fender Amps: 1985 - Current / Brand New 68 custom vibrolux reverb



Jan 21st, 2017 02:19 PM   Edit   Profile  

Took a dump after the first hour. I found out it was a pre amp tube. The online outfit that sold me the amp sent a new set of tubes. They sent 4 jj ecc83-s and two 12at7 grove tubes. The oem tubes that were in the amp were all grove tubes. 2 12at7's a 3 count of ecc83-3's and a odd ball 12ax7-c. What's up with the odd tube? Is it because of the custom channel? Or did they screw up at the factory?

(This message was last edited by Lowhog at 04:21 PM, Jan 21st, 2017)


It's not just good..

...it's good enough.
Jan 23rd, 2017 08:20 AM   Edit   Profile  

"What's up with the odd tube? Is it because of the custom channel?"

Could be. Where was the odd-ball tube located?


It's not just good..

...it's good enough.
Jan 23rd, 2017 08:22 AM   Edit   Profile  

This might help...

Tube layout chart

Contributing Member

So. Cal. USA

Jan 23rd, 2017 11:41 AM   Edit   Profile  

Can't really comment on the odd ball tube, a working 12AX7 should work in any location designed for a 12AX7.

I will say that the GT tubes that come stock in a Fender amp are lower quality IMO the GTs you would buy after market. I would not be surprised to see one fail however unless you reseated all the tubes in their sockets the tube it may have not been a tube failure. It could have been a socket connection.

No worries about the JJ ECC83-S. I like the spiral wound JJs and use them all the time in my amps.



Jan 24th, 2017 03:18 AM   Edit   Profile  

Fender amps...




Jan 24th, 2017 06:00 PM   Edit   Profile  

At first a bad hum and that was all the sound I could get. Than I reseated all the tubes after the failure. After reseating The amp tubes it played for a minute then a bad crackling sound and quit.I shut it down till the new tubes arrived. I Replaced the three ecc83s and the one od ball 12ax7-3 with four ecc83-s JJ's. Looking at the chart inside the amp it calls for two 12at7's and four 12ax7a's for the pre amp. The odd ball tube was on the vintage channel. It sounds great with the 4 JJ's so I'll leave it as is.



Jan 24th, 2017 06:07 PM   Edit   Profile  

Little different gain between the 12ax7- Chinese and the ecc83?



Jan 24th, 2017 06:08 PM   Edit   Profile  

Thanks for the chart and the link.



Jan 24th, 2017 06:15 PM   Edit   Profile  

Looking at your chart MLC the odd ball was in v5 tremolo socket.


It's not just good..

...it's good enough.
Jan 25th, 2017 08:25 AM   Edit   Profile  

V5/tremolo tube isn't doing much for your overall tone - perfect spot for a lower quality tube.
As long as it works and it's quiet, it's fine for V5.


San Diego

Land of Sea, home of the Waves
Sep 19th, 2017 10:50 AM   Edit   Profile  

Oh in regards to the preamp tubes you really do not need to replace all of them only when a specific tube goes bad. Nice of them to send an entire set though.

FDP Forum / Fender Amps: 1985 - Current / Brand New 68 custom vibrolux reverb

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