Bottlehead Kits > S.E.X. Kit
S.e.x. with iron upgrade
tttubes:
How would i wire the magequest otf for 4 ohms.
Paul Joppa:
That depends on which S.E.X. amp version you have. Here are the versions:
Original SEX monoblocs (Magnequest upgrade TFA-204)
Revision 1.0 (1996) (Magnequest upgrade TFA-204)
Revision 1.1 (1996) (Magnequest upgrade TFA-204)
Revision 2.0 (1997) (Magnequest upgrade TFA-204)
ParaSEX (1999) (no upgrade)
Stereo SEX
Version 2.0 (2004) (Magnequest upgrade BH-2 choke, BH-1 transfprmer 8 ohms only)
(Bottlehead upgrade PC-3 choke, OT-2 transformer)
Revision 2.1 (2011) (stock Bottlehead PC-3 choke, OT-2 transformer - no upgrades)
Revision 3 (2017) (stock Bottlehead PC-3 choke, OT-2 transformer - no upgrades)
tttubes:
--- Quote from: Paul Joppa on January 27, 2025, 10:17:23 AM ---That depends on which S.E.X. amp version you have. Here are the versions:
Original SEX monoblocs (Magnequest upgrade TFA-204)
Revision 1.0 (1996) (Magnequest upgrade TFA-204)
Revision 1.1 (1996) (Magnequest upgrade TFA-204)
Revision 2.0 (1997) (Magnequest upgrade TFA-204)
ParaSEX (1999) (no upgrade)
Stereo SEX
ersion 2.0 (2004) (Magnequest upgrade BH-2 choke, BH-1 transfprmer 8 ohms only)
(Bottlehead upgrade PC-3 choke, OT-2 transformer)
Revision 2.1 (2011) (stock Bottlehead PC-3 choke, OT-2 transformer - no upgrades)
Revision 3 (2017) (stock Bottlehead PC-3 choke, OT-2 transformer - no upgrades)
--- End quote ---
Do these pics help I it saw a one
tttubes:
and this
Paul Joppa:
Thanks for the pictures. That is a SEX 2.0 with the Bottlehead Iron Upgrade kit (and a lot of other cool mods!)
On pages 10 and 11 of the upgrade kit manual, there are detailed instructions and photos for wiring the OT-2 output transformer for 4/8/16/32 ohms.
In case you no longer have the manual, I've attached a set of connection instructions, unfortunately without photos. The numbers refer to the solder lug numbers embossed on the transformer bobbin. (Lugs 4 and 9 are the missing ones.)
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