And you need to verify that it is not a speaker issue.
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Show posts MenuQuote from: Roly on April 15, 2013, 01:43:35 AMThat's what the little "[informative][useless]" buttons are for.Thanks Roly, did not even realize those buttons existed (under posters name).
Quote from: g1 on April 11, 2013, 11:42:03 AMSorry about this, it is incorrect. To quote you from an earlier post "I should just delete that last entry as it makes me look like the jerk that I feel I am"Quote from: J M Fahey on April 11, 2013, 02:40:51 AMOops! Thanks JM, I had forgot to consider impedances.
afaik the Vox has 16 ohms only output, or maybe 8/16 , but that pair of Frontman speakers is wired for 4 ohms.
The Fender speakers wiring will have to be changed from parallel to series (simple). Then it will be an 8 ohm cabinet.
The Vox has an 8/16 switch on the back which will have to be set to 8. The Fender cab will have to be plugged into the EXTERNAL spkr. jack, not the extension jack. This will mean the Vox's own speaker can not be used at the same time.
When used by itself, the Fender amp will give a tiny bit less power into the 8 ohm cab than the 4 ohm stock cab wiring.
ctguy1955, I hope this is still a workable scenario for you.
Quote from: g1 on April 10, 2013, 07:47:52 PMQuote from: Andy54 on April 10, 2013, 03:47:36 AM
The attached pic I think shows the transformer in question. It has three red wires attached to the board.
That is the power transformer. It is not "stepping down" 240 to 120V, it is transforming the 240V to the voltage the power supply uses. You plug it in to a 240V outlet, yes? So it is already wired up for 240V operation.
It is the same size/weight as a north american version of the amp would use, you can't downsize. Yes, new amplifiers deliver more power and weigh less, like modern cars do.
Quote from: J M Fahey on April 11, 2013, 02:40:51 AMOops! Thanks JM, I had forgot to consider impedances.
afaik the Vox has 16 ohms only output, or maybe 8/16 , but that pair of Frontman speakers is wired for 4 ohms.
Quote from: Andy54 on April 10, 2013, 03:47:36 AM
The attached pic I think shows the transformer in question. It has three red wires attached to the board.
Quote from: ctguy1955 on April 09, 2013, 08:57:21 PMSorry about the confusion here, I am talking about the Fender amp. You said you now have a 100W head. All I'm saying is it will not be able to be used as a "head" to drive some other speaker cab. That would require a different wiring scheme.Quote from: g1 on April 08, 2013, 12:09:49 PMQuote from: ctguy1955 on April 07, 2013, 08:44:20 PM
I will be able to not only have a nice 2 x 12 Cab for my extension speakers for 199 bucks, I will also be gaining a 100 watt head for free !!!!!!!!!!!
Just so you don't get ahead of yourself, this jack is only a "speaker in" , not "amp out" so you do not have a separate head available. That would be another scenario.
yes, but the subject tells you I want to use my ac15c2 extension out as the amp (head) that will drive just the speakers of the Fender FM 212R speakers.
Quote from: ctguy1955 on April 07, 2013, 08:44:20 PM
I will be able to not only have a nice 2 x 12 Cab for my extension speakers for 199 bucks, I will also be gaining a 100 watt head for free !!!!!!!!!!!
Quote from: Roly on March 27, 2013, 08:11:33 AMJust wanted to comment on this even though we are now dealing with a different model of amp. The gv60 or gv100 power amps are basically copies of later (cathode driven) Musicman amps. The cathodes are not at ground due to the transistors, so the full B+ is not across the tube. Also, the screens are run at around half the plate voltage. I believe this is how these circuits get away with running 6L6's at such high voltages (see Musicman schematics). I believe the higher power Musicman amps claimed 150W from a quad of 6L6.
I also have to say that I'm mildly astonished a) by the manufacturers' claim of 100 watts out of a pair of 6L6's, then b) by the HT voltages shown on the circuit, 585V for the 60 watt version, and 715V for the "100 watt" version.