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problem setting up Fi X 2a3 amp

73.9.31.8
Posted on November 1, 2014 at 08:16:50
Angaria
Audiophile

Posts: 13
Location: Pittsburgh
Joined: July 4, 2006
 Which way do you insert the 2a3 on a Fi X amp? The socket sizes are literally exactly the same size, so I can't tell where the cathod(large) pins are supposed to go. The socket is labeled with 1,2,3,4 positions, but I'm not sure what that corresponds to. Thanks!

 

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RE: problem setting up Fi X 2a3 amp, posted on November 1, 2014 at 10:38:49
Tre'
Industry Professional

Posts: 17294
Location: So. Cal.
Joined: February 9, 2002
 1 and 4 are the filament pins, the larger pins.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

 

RE: problem setting up Fi X 2a3 amp, posted on November 1, 2014 at 13:53:07
mbhcid
Audiophile

Posts: 224
Location: east coast
Joined: August 8, 2006



If in doubt, flip it over and the two pins with the green wires are the filament (fat) pins (should be facing towards front of amp) The blue and red wires should go to the B+ and OPT.

 

Flip it over solution..., posted on November 1, 2014 at 20:24:01
Topper
Audiophile

Posts: 957
Location: New England
Joined: April 19, 2001
 That would be good advice except that unfortunately the amp you show isn't a Fi X and that design doesn't have a "flip it over "option.

W

 

RE: problem setting up Fi X 2a3 amp, posted on November 1, 2014 at 20:30:10
belyin
Audiophile

Posts: 1285
Location: New Orleans
Joined: November 1, 2003
 On my Super X 2A3 the smaller pins go on top, the larger on the bottom.

 

RE: Flip it over solution..., posted on November 2, 2014 at 04:32:14
mbhcid
Audiophile

Posts: 224
Location: east coast
Joined: August 8, 2006
 Right. I just saw Fi 2A3 and missed the part about it being an "X".

 

RE: Flip it over solution..., posted on November 2, 2014 at 17:51:02
Angaria
Audiophile

Posts: 13
Location: Pittsburgh
Joined: July 4, 2006
 Hi Guys - thank you for the tips, and yes, it takes a fair bit of work to get into the X.

 

Simple Multi Meter Solution ...duhh.....guys and girls ..., posted on November 2, 2014 at 18:57:54
drlowmu
Manufacturer

Posts: 9730
Location: East of Kansas City
Joined: January 10, 2005
 Pull rectifier tube from amplifier, so it makes NO B+

Turn amp ON.

On 4 pin output tube socket, with Multi Meter set to AC volts, low scale, find the two consecutive pins that read 2.5 VAC. MARK those pins with a dot on the socket, etc.

It will read higher somewhat than 2.5 VAC, with the power trannie being totally unloaded.

Safe, easy, foolproof method, confirmed by meter under operating conditions.

Jeff Medwin

 

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