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Alan Foster (workhouse)
Username: workhouse

Registered: 05-2013
Posted on Wednesday, May 22, 2013 - 07:28 pm:   

I have acquired a 212- 65 and discovered the power requirement is 120 volt mains as detailed on the back panel plate. I live in the UK so I wish to know if there is a 250v tap on the primary winding on the existing transformer, or do I have to source a replacement (Euro)transformer ?
Please advise.
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Lars Verholt (lmv)
Username: lmv

Registered: 11-2009
Posted on Saturday, May 25, 2013 - 10:46 am:   

Hi Alan,
if this amp was originally sold in North America, the mains transformer does not have a tap for 220/250V. You can get a replacement transformer from www.tubeampdoctor.com . Please note, if your amp is the old type with the 12AX7/ECC83 phase splitter tube (valve), a slight modification is required. The modification is documented in a Music Man service bulletin that you can download from this forum's website.

Cheers,
Lars Verholt
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Alan Foster (workhouse)
Username: workhouse

Registered: 05-2013
Posted on Wednesday, May 29, 2013 - 02:48 am:   

Hi Lars,
Thank you for you help with my query. Yes it does have a 12AX7/ECC83 phase splitter so I'll check out the service bulletin. I'll power it up with a variac before I go any further just to make sure the amp is in a reasonable condition and the output transformer is OK. I aim to fit EL34's as I understand this is a straight swop out without modification.

regards
Alan
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Mike Kaus (mm210)
Username: mm210

Registered: 05-2006
Posted on Wednesday, May 29, 2013 - 08:50 am:   

Straight swap yes but I DO suggest tightening and cleaning the sockets when you replace them. That amp is 1974-77 or so and it may have loosened up a little. Just my 2c's worth. It could use a cap job too. They're 30+ years old. Mike.
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Alan Foster (workhouse)
Username: workhouse

Registered: 05-2013
Posted on Saturday, June 01, 2013 - 02:03 am:   

Hi Mike,
Thanks for the tip, like me I must be due a cap job as well then I was in my mid 20's .... seemed like yesterday Alan.

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