#v-4b

[fuckyeahampworship]

LowAmp 4x15

Ampeg V4B Ampeg VT22 

Submitted by aveclaudenum

[fuckyeahampworship]

So nice that you got it down to $450! Additionally, I'm running the JJ 7027s in mine (the dude I bought it off had recently replaced them) and you know how it sounds. I've actually been considering modding mine to take 6550's instead, but I need to look more into it.

I meannn it was selling for only $500, so I didn't drive it down too much considering that's still the lowest price I've seen on a V-4B in recent years. But it WAS the difference between maxing out my credit card, and still being able to treat my girlfriend to a fancy anniversary dinner.

If you changed out the power tubes, I wonder how drastic the difference in tone would be for a non-master volume amp like this, since most of the breakup would appear to come from driving the power section. Also curious how it would manifest itself considering that you rely somewhat heavily on that Boss ODB box.

[fuckyeahampworship]

mine has black switches...weird. you seem to know a lot about them though, which is good. mine has a set of ruby 7027s in the power section as well. isnt there another type of tube you can use instead of 7027s without having to mod the amp?

Yeah, the black switches are pre-'76 I'm pretty sure. You probably have metal toggle switches for power/standby/polarity as well, I'm guessing?

And yes - Ampeg was aware that 7027s would become obsolete, so they're pretty much interchangeable with matched pairs/a quad of 6L6-GCs, 7581s, 5881s, 6L6-WGBs, or KT66s. With some relatively minor tweaks, you should also be able to implement 6550s, KT88s, KT90s, 6CA7s and even EL34s as well.

Of course, nothing is ever simple, and there are some noteworthy caveats when it comes to biasing and current draw from the other types of tubes. This page has it outlined pretty thoroughly.

[fuckyeahampworship]

120 watts all tube was just too much for the bars we were playing. Couldn't get it to where the tubes would start really kicking in without blowing the damn bar apart. I could have put an attenuator on it, that way I could control the volume, but still get my tubes where they would work good. Instead, I got the DT, and its smaller, and plus I can run it at 7 watts and crank it and its a lot more volume friendly. But it also didn't fit well with the music we are playing either.

I hear ya. I'm looking into one of them THD Hotplates for my V-4B now.