Better safe than sorry.
Better safe than sorry.
Well, it's looking like a pretty consistent 244-245 at the moment! Will check a few more times later.
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A mainly digital setup with a musical amplifier and endearing 1970's speakers. A CD player that hardly ever gets used and a turntable that is good enough to remind my how enjoyable my old vinyl is. Some cables and things.
No surprise to me.
Looks like you'll be needing a transformer then.
A mainly digital setup with a musical amplifier and endearing 1970's speakers. A CD player that hardly ever gets used and a turntable that is good enough to remind my how enjoyable my old vinyl is. Some cables and things.
Measured it again this morning from the surge suppressor that the headphone amp is plugged into and the reading was a constant 242V.
A mainly digital setup with a musical amplifier and endearing 1970's speakers. A CD player that hardly ever gets used and a turntable that is good enough to remind my how enjoyable my old vinyl is. Some cables and things.
That's about 11% over the specified voltage for the amp, but personally I still wouldn't want an external transformer if I could avoid it. I would measure the voltage across the capacitors in the amp to check they're ok first. Anything to avoid extra boxes - and expense
Sounds like the OP isn't confident about mooching around inside the amp, but I agree that doing measurements to confirm the overvoltage (or not) is the best course of action.
If the valve heaters are running at +11% then that's going to be around 7V, not something i'd like to do for any extended time.
I modified a Chinese preamp that was rated for 220V, when I measured the valve heater voltage is was well over 7V with UK mains, so I fitted a bucking transformer internally.
Having just looked at internal shots of the Little Dot there isn't any room to fit an extra transformer internally.
I've just read that someone fitted extra low value resistors to combat the excess heater voltage as shown on this photo:
Last edited by Firebottle; 05-07-2017 at 09:15. Reason: Internal comment
if those get hot they are going to damage the board. think a 230v regen would be best overall. a bit pricier but will help everything and its not going to encroach on any design.. only a 5% increase in voltage should be fine
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Thanks all for your input on this, there's no substitute for the experience of people who have dealt with stuff every day!
I'm generally ok with condensing what I need out of a ton of technical information but my background is software and I have little exposure to electronics other than swapping components and rebuilding computers.
I'm inclined to go with Grant's suggestion of a 230v regen on the basis that it will cover everything, including any future purchases. Any preferred suppliers or devices I should be considering?
I was looking at this site a little earlier https://airlinktransformers.com/cate...d-power-supply
A mainly digital setup with a musical amplifier and endearing 1970's speakers. A CD player that hardly ever gets used and a turntable that is good enough to remind my how enjoyable my old vinyl is. Some cables and things.