Variac mode question

Discussion for the new Mark V

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mixsit
Mark I
Posts: 30
Joined: Wed Jun 09, 2010 3:02 pm

Variac mode question

Post by mixsit » Sat Sep 09, 2017 1:10 am

Does it reduce voltage to the entire amp, of just certain sections or circuits?
The manual has a fairly straight forward statement about it which leads me to think it may indeed mean everything sees lower voltage, just wondering.
Thanks

bandit2013
Triple Recto
Posts: 3143
Joined: Fri Feb 22, 2013 7:31 am
Location: North Carolina

Re: Variac mode question

Post by bandit2013 » Sat Sep 09, 2017 8:27 am

Variac mode feeds power to the PT on a different tap of the primary side, thus it will affect everything on the secondary side of the power transformer. However most of the accessory circuits for the switching logic control and the sensitive preamp tube heater circuits that are DC will remain consistent as they are regulated so there is plenty of headroom on those circuits to maintain consistent operation at full power or variac power.

mixsit
Mark I
Posts: 30
Joined: Wed Jun 09, 2010 3:02 pm

Re: Variac mode question

Post by mixsit » Sun Sep 10, 2017 5:52 pm

Thank you Sir! 'Question came up for my mind when someone on a form asked about the use of variacs. I played with one on a Twin for a bit but that was years ago.

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