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MichaelK
Newbie Alert
Joined: 24 Dec 2006
Posts: 3
Location: Munkatuna
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 Posted: Mon Jan 29, 2007 3:27 pm Post subject: Removing valves in a Vox AC30CC OK? |
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I saw the thread below about removing half the power tubes to reduce wattage. My question specifically is, is it OK to do that in a Vox AC30CC?
In another forum
(http://www.thegearpage.net/board/showthread.php?t=209884)
someone said that when that's done one should reduce the resistance setting by half. The NeoDog in the AC30CC1 is rated at 16 ohms, and setting the output switch to 8 ohms is easy enough... but should I then be using an 8 ohm speaker?
Before I go ahead and start a fire, blow out my speaker, fry my output transformer or something equally stupid, can someone verify if it is safe to proceed as described with this particular amp? |
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MichaelK
Newbie Alert
Joined: 24 Dec 2006
Posts: 3
Location: Munkatuna
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| Posted: Mon Jan 29, 2007 4:01 pm Post subject: |
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Update: I posted the same question in that same thread on TGP and got this answer from Doug Roccaforte, which I think is definitely worth sharing:
| Quote: | If you pull two tubes on your AC30 the remaining two will blow up instantly!!!!! DO NOT TRY THIS
To everyone, never pull tubes on a Cathode biased amplifier unless the manufacturer says you can.
The reason is, if all 4 tubes share the same cathode resistor,
this value will be too low for 2 tubes.
AC30= 50 ohm resistor for 4 tubes.
You would need a 150 ohm resistor for two in this amp. |
So that's that, I guess! |
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owwdatune
Moderator
Joined: 08 Jan 2004
Posts: 396
Location: ...on the long and winding road...
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| Posted: Mon Jan 29, 2007 5:32 pm Post subject: |
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if anyone would know, it would be Mr. Roccaforte http://www.roccaforteamps.com/ thats for sure---like you said....thats that 
_________________
~T~...Live a little >crank it up< ...
--> SAVE A LIFE - ADOPT A SHELTER/RESCUE PET <-- |
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CustomArtHistoric57
Not So Newbie
Joined: 31 Jan 2007
Posts: 6
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| Posted: Wed Jan 31, 2007 9:34 am Post subject: |
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I just installed a THD Hot Plate 16 ohn attenuator, even though you can run this amp at around 20 watts, its still loud for small venues. I love the Hot Plate, it opens these amps up and they just sing. It took about an hour and a half to re-solder the connections though. But, well worth the time and money. I'am a little dissapointed however with the pain of removing the chassis to change tubes though, what the hecks up with that.
I've always had Fender amps and they were a breeze to retube.
Anyway, enjoy the amp they do sound great. |
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Jensked
Not So Newbie
Joined: 26 Jan 2007
Posts: 6
Location: Belgium
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| Posted: Thu Feb 01, 2007 1:09 am Post subject: |
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| CustomArtHistoric57 wrote: | | II'am a little dissapointed however with the pain of removing the chassis to change tubes though, what the hecks up with that. |
I hear you brother. In the store they said it was a piece of cake. I bet the guy never even tried to change tubes in an AC30...what bothers me the most, is that those things aren't explained in the manual. |
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arclight05
Sea Monkey
Joined: 02 Sep 2007
Posts: 10
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| Posted: Sun Sep 02, 2007 8:31 pm Post subject: |
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| i removed two tubes from My power section in my ac30 .. not a prob .Just remember the two pairs are ...inside twotubes is one pair ... outside two tubes is the other pair .. Sound is lower , but not as rich as with all tubes in circuit ... mine now has 4 back in ... better sound |
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