It looks like it has "50" and "60" but I have no clue what this will do.
Can anyone clue me in?
Should I flip it?!?
Thanks!
What will the "VAC" switch on the back of my AD30 do?
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- Orange Master
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- Duke of Orange
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Re: What will the "VAC" switch on the back of my AD30 do?
Sounds like the mains voltage selector switch. Do not flip it!!!
The 50 / 60 Hz thing: Apart from different voltages (around 115 / 230V) US and European mains supplies have different AC (alternating current) frequencies, 50Hz in Europe, 60Hz in the US. The amp can run on either frequency but MUST be set to the correct voltage!
http://www.worldstandards.eu/electricit ... y-country/" onclick="window.open(this.href);return false;
Andy.
The 50 / 60 Hz thing: Apart from different voltages (around 115 / 230V) US and European mains supplies have different AC (alternating current) frequencies, 50Hz in Europe, 60Hz in the US. The amp can run on either frequency but MUST be set to the correct voltage!
http://www.worldstandards.eu/electricit ... y-country/" onclick="window.open(this.href);return false;
Andy.
aNDyH.
Ever tried to outstare a mirror?
In the bathtub of history the truth is harder to hold than the soap, and much more difficult to find!
Ever tried to outstare a mirror?
In the bathtub of history the truth is harder to hold than the soap, and much more difficult to find!
Re: What will the "VAC" switch on the back of my AD30 do?
Seems strange that they use a switch toggle (I assume you mean it's a toggle) for that... I've never seen one on any amp. Show us a pic!
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- Duke of Orange
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Re: What will the "VAC" switch on the back of my AD30 do?
Probably just the normal recessed slider switch, for 100V / 120V in the US. (Set to 120!)
Andy.
Andy.
aNDyH.
Ever tried to outstare a mirror?
In the bathtub of history the truth is harder to hold than the soap, and much more difficult to find!
Ever tried to outstare a mirror?
In the bathtub of history the truth is harder to hold than the soap, and much more difficult to find!
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- Orange Master
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Re: What will the "VAC" switch on the back of my AD30 do?
Thanks, gents!!!
(I wasn't going to switch it over w/o knowing.)
(I wasn't going to switch it over w/o knowing.)
Re: What will the "VAC" switch on the back of my AD30 do?
They need to stop making those accessible.....
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Re: What will the "VAC" switch on the back of my AD30 do?
Can you even simply switch if you're traveling overseas and want to use it? I think there's a lot more to it than that isn't there?Jondog wrote:They need to stop making those accessible.....
You know what would be handy... external bias sockets and trim pot for those amps that need biasing.
Jake
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Re: What will the "VAC" switch on the back of my AD30 do?
+100Thinline_slim wrote:You know what would be handy... external bias sockets and trim pot for those amps that need biasing.
I owned a Rogue (canadian brand) hifi-amp with 4 Tung Sol KT-120's. It had a bias meter and trim pots on the top plate. A dream to handle though my current hifi-amp has auto bias and that's even better...
RV100 MKIII | '75 OR120 | OR100 | OR50 | CS50 | R30H | TT
2 x PPC412
Bax B. | Amp D.
Marshall 1959 HW + 1936V
Fender '65 Super Reverb Reissue
Vox AC30C2X + V212C
Playing Les Pauls and Teles...
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Re: What will the "VAC" switch on the back of my AD30 do?
Yes, it's a red slider, and it switches between 100V and 120V (for models shipped here to the states).
I bought my AD30 used. I ran it for quite some time without ever messing with it. I never needed to, as it worked flawlessly and sounded great. One day, I was in the chassis with a flashlight installing Velcro ties for the power cable. I had unplugged the speaker cable and looked up and noticed that little switch. I also noticed it was set to 100V!
Actually. It gets worse than that...the amp was also modded with 250 ohm cathode resistors. Presumably, someone had it on the wrong voltage setting, and since the EL84s were running super hot, they changed the cathode resistors out to calm things down.
God knows how long it was running like this. It was putting 460V on the plates. IIRC. Heaters were seeing close to 7VAC. The amp sounded great. Dare I say I liked the sound a little better then when I brought it back to stock. But the EL84s were running at like 18W each, IIRC. It's curious they lasted so long like that. They never red plated or protested in any way.
Anyways, long story short, keep the switch in the proper position.
-Nick
I bought my AD30 used. I ran it for quite some time without ever messing with it. I never needed to, as it worked flawlessly and sounded great. One day, I was in the chassis with a flashlight installing Velcro ties for the power cable. I had unplugged the speaker cable and looked up and noticed that little switch. I also noticed it was set to 100V!
Actually. It gets worse than that...the amp was also modded with 250 ohm cathode resistors. Presumably, someone had it on the wrong voltage setting, and since the EL84s were running super hot, they changed the cathode resistors out to calm things down.
God knows how long it was running like this. It was putting 460V on the plates. IIRC. Heaters were seeing close to 7VAC. The amp sounded great. Dare I say I liked the sound a little better then when I brought it back to stock. But the EL84s were running at like 18W each, IIRC. It's curious they lasted so long like that. They never red plated or protested in any way.
Anyways, long story short, keep the switch in the proper position.
-Nick
'71 GRO100 || '96 OR-80 || AD30 || '64 AC-50 || AC-30TBX || Hiwatt DR504 || HI-TONE HT30
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