Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: guitarhvac on March 10, 2011, 03:31:14 pm
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I have a question that i'm just curious about! Any help would be appreciated.
Can i take an output transformer out of a twin reverb and put it in a vibrolux to make the vibrolux more powerful without harming the vibrolux in any way?
If so would i have to make any more changes to the vibrolux- like speaker impedance
Thanks a lot!
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Don't do this--- a Twin Reverb OT in a BF Vibrolux won't make the Vibrolux more powerful---If you changed the PT to one with much more current capacity (HT and enough heater current to run 6L6GCx4)--- adding the two more 6L6GC output tubes, along with the Twin OT, then it would be easily more powerful-------- but it would be essentially a Twin Reverb and no longer a Vibrolux Reverb.
OTOH---- some do use BF Bassman-sized OT's in Bandmasters (that have the same OT as BF Vibrolux)---some consider this an upgrade----i did this to one of my beater BF Bandmasters and i think it's just different--- not better than stock.
Anyway, adding a larger OT to an existing amp doesn't increase power----- it can add aditional bass response, but that's not exactly the same thing.........................gldtp99
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A larger OT will give more headroom but the amp will not breakup until 9 on the volume if then. Like gldtp99 said you dont want to do this to a Vibrolux amp. The Vibrolux is a special amp and is what it is.
A peach that should be left alone. Even when it is ripe it is not to be plucked :laugh:
It's in the water. :dontknow:
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Yes you can do that with no issues at all except....you will need to up the speaker impedance to 8 ohms so the tubes see the right loading.
The twin had 4 output tubes and a 4 ohm load from two 8 ohm speakers in parallel.Now you can remove 2 tubes from the twin and disconnect one speaker to get a proper load and then you will have 8 ohms.
It will not increase output power but it will increase the clean headroom before breakup dramatically.And yes it will have more bottom end too.
So you would have to run two 16 ohm speakers in parallel to get the right load for your tubes.You could run the mismatch at 4 ohms for a while but it's not really optimum for your tubes. Fender amps all had the speaker out jack on the back of their combos and many people ran extension speakers for years at half the load so it may just be fine as long as you don't dime your amp a lot.
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Cesar Dias used to put 100 watt OT's in 50 watt amps. He would beef up the filtering on the power supply too. This would give the amp a beefy tone with less breakup and more bottom end... Like Stevie Ray had.
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It might be a good idea if you want to use the Vibrolux for bass. Otherwise, I don't see the point.
Dave
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I play country music so i'm after a very little breakup if any at all. That's why i wanted to try swapping the trannys!
Thanks for the replys guys!!