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Thread: Fender Super Twin.

  1. #171
    GAStronomist DrNomis_44's Avatar
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    I just checked the Evatco website and they stock a big range of electrolytic caps, I really want to go with all F&T caps as replacements, but some values, like 200uF/500V, I need are currently listed as on "back order", so it looks like I need to wait.

  2. #172
    GAStronomist Simon Barden's Avatar
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    Tried other suppliers for F&T caps? I know itís nice to try and get all your parts in one go to minimise shipping, but if itís holding your project up, itís worth looking around.

  3. #173
    GAStronomist DrNomis_44's Avatar
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    Good point, I can't really do any ordering cause I'm broke so I'll have to wait till I can afford the new caps.

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  5. #175
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    F&T are okay caps - there's nothing wrong with Vishay. Sprague the brandname is owned by Vishay - if you cut the new big blue Spragues that llook good for restos apart, you find a small Vishay cap inside. Due to improvements in cap materials modern high voltage caps are small.

    The 6X8 is readily available pretty cheap NOS or used. The 6C10 on the other hand, is not readily available. My 83 Superchamp uses it. Last time I bought them, I got a couple of second hand ones for about $85. One is a Du Pont and the other is a GE. 6AC10s fit OK, but the envelope is a bit bigger, and it has a 100% and two 70% gain triodes. That is a 12AX7, with the second two are equal to a 12AT7 set of triodes.

    A lot of people convert the compactron socket. It can take a 9 pin and a 7 pin side by side in the same opening. A 6AU6 is a single triode of 100% gain - i.e. it's half a 12AX7 triode. 6AU6s are very plentiful and it's a tiny tube. One of the guys on the tele board made an adaptor that plugs into the compactron 10-pin and fits two 12AX7s giving you a spare triode.

  6. #176
    GAStronomist DrNomis_44's Avatar
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    Quote Originally Posted by Dacious View Post
    F&T are okay caps - there's nothing wrong with Vishay. Sprague the brandname is owned by Vishay - if you cut the new big blue Spragues that llook good for restos apart, you find a small Vishay cap inside. Due to improvements in cap materials modern high voltage caps are small.

    The 6X8 is readily available pretty cheap NOS or used. The 6C10 on the other hand, is not readily available. My 83 Superchamp uses it. Last time I bought them, I got a couple of second hand ones for about $85. One is a Du Pont and the other is a GE. 6AC10s fit OK, but the envelope is a bit bigger, and it has a 100% and two 70% gain triodes. That is a 12AX7, with the second two are equal to a 12AT7 set of triodes.

    A lot of people convert the compactron socket. It can take a 9 pin and a 7 pin side by side in the same opening. A 6AU6 is a single triode of 100% gain - i.e. it's half a 12AX7 triode. 6AU6s are very plentiful and it's a tiny tube. One of the guys on the tele board made an adaptor that plugs into the compactron 10-pin and fits two 12AX7s giving you a spare triode.


    Tubes used in my Non-Reverb Fender Super Twin are as follows:


    X6 6L6 Beam-Power Tetrodes (actually Mesa/Boogie brand STR 415 6L6).

    X1 12AU7 Twin Triode.

    X1 12AT7 Twin Triode.

    X1 12AX7 Twin Triode.

    X2 7025 Twin Triode (low-noise 12AX7/ECC83).

  7. #177
    GAStronomist DrNomis_44's Avatar
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    Update:

    Recently I got in contact with a mate of mine who just happens to do amp servicing, he offered to give me some second-hand 16uF/450V and 22uF/500V capacitors he had pulled out of an amp, but were still perfectly good, so I took him up on the offer, he dropped-off the caps in my mailbox a few weeks ago, and I had a look through them and selected a light-grey 22uF/500V Illinois Cap as a suitable replacement for the 16uF/500V cap that had leaked, I soldered it into place on the eyelet board under the doghouse, then put the Super Twin amp back together and gave it a test-out, the amp seems to be working fine with the replacement cap installed, so that'll do fine till I can get a full set of brand-new caps ordered.


    A pic of the old and leaky cap:

    Click image for larger version. 

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    Notice how there's an obvious bulge next to the cap's + terminal?, basically what happened to cause that was that, for some reason, the electrolyte inside the cap got hot enough to boil, and because the pressure inside the cap got a bit too much the rubber bung sealing the + end of the cap ruptured, letting the electrolyte leak-out, if you see an electrolytic cap with a slight small bulge in it's rubber sealing bung, or in a similar condition to the one in the pic, it needs replacing with a new one asap otherwise it could cause expensive damage to your amp.
    Last edited by DrNomis_44; 19-11-2020 at 06:25 PM.

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