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Early '70s Ampeg V-4B Impressions

Jefenator

Jefenator

Aug 22, 2008
6,955
10,129
Oregon
www.jeffaddicottglassworks.com
#1
I gigged out my new-to-me V-4B for the first time, last night. Here's my take, so far.

We started out with a mellow rendition of "Let's Stay Together". Playing fingerstyle with the tone rolled off, I have never had a bass rig feel so "right". :bassist:

I tried a few things to bring out the pick attack while leaving the bottom largely intact. I settled on the "ultra-hi" switch. Not as "spanky" as the Sunn (or as deep, for that matter) but it worked. Apart from that, I was pretty pleased with all 3 knobs at 12 o'clock. I wanted to experience that true vintage Ampeg "grunt" and I definitely felt it!

As one would hope, this 100 watt amp did fill the room and punch it out a little more than my 60 watt Sunn does. Unfortunately, toward the end of the last set, I had hit my volume ceiling. That disappointed me a bit, given just how bulky and heavy this thing is. (A proper servicing might help - I have no idea what shape the tubes & caps are in.)

So there it is. It's not the most practical piece of gear I've ever tried, but I'm glad I took the plunge.

I welcome any other V-4 users' thoughts.
 
#7
It's the GS, which is a bit "scooped". :hmm:

But really, running out of tube headroom isn't so terrible. :D

I've been using the 60 watt Sunn on that gig a lot and sometimes I think the lower wattage is good for keeping a cap on things. By the time that's maxxing out, we're plenty loud for a monday night.

For saturday nights, I've got the 180 watt Mesa. :hyper:
 
#8
the V4B is a GREAT sounding head! I recently sold mine (to a buddy who still lets me jam it in his studio/rehearsal space) but I'll buy another someday soon, I'm sure

here's a shot with mine on top of my Orange 15" for some GAS
000_0147.jpg


(ran it with a 66 Jazz bass too :p talk about TONE FOR DAYS)
 
#10
glad this thread popped up. i recently bought a V4, i thought it was damaged on shipping so i took it to my tech, turns out some of the preamp tubes were installed incorrectly and it had two fried power tubes. no big deal, easy to fix, good news.

he mentioned that these heads are "fixed bias" and is doing some sort of mod to make the bias adjustable. while i understand the differences, im just wondering, what are the pros and cons of a fixed bias vs self bias? is there any reason that i should have kept this head fixed instead of him changing it to self?

any info would be awesome. thanks guys!
 
#11
I believe - and this is from trying to remember stuff I've read, not technical expertise, but - fixed bias just means the bias is set by sets of resistors, which can drift over time. Adding an adjustable bias pot onto the board allows you to control for that a little better and really hit the sweet spot of your tubes. I don't see a reason to be concerned. My tech installed a bias pot in mine the first time he had it in the shop as well.

To the OP - a bigger cab would definitely help out in the volume end of things. I use an early 70s 8x10 with mine. It's beastly, both in sound and weight.
 
#14
I've got a V4-B and the few times I ran it, I used my Berg NV425, and the volume was noticeably louder than using my 8x10 before breaking-up ... so to get the maximum clean volume, you''ll need a efficient cabinet .. the settings I used were treble 12 noon - Mid switch 300, control at about 1 o'clock - bass at about 1 o'clock .... the bass was a P-bass with reissue 62 pick-ups and flatwound strings
 
#15
V4B. Wow, that takes me back. I didn't like mine all that much. As others have said, cab efficiency is the name of the game with any amp in this power class. If you really want this amp to shine, try two 2x15 cabs with it. On big jobs I used to run mine into a B25B and a V6B stacked horizontally for a total of four fifteens. All with the factory drivers. I tried this amp with an SVT cab for a while but it was unusable at volume; that cab simply had too little ROI on a decibel-per-watt basis. There was a reason the designated mate to the V4B head was a folded horn. That's called "a clue." ;-)
 
#16
craig.p said:
I tried this amp with an SVT cab for a while but it was unusable at volume; that cab simply had too little ROI on a decibel-per-watt basis. There was a reason the designated mate to the V4B head was a folded horn. That's called "a clue." ;-)
Click to expand...

I don't know man, I can't get much higher than 9:30-10 on the dial before I'm melting faces with this......

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#17
Uhh, Jeff? Were we maybe separated at birth?? We have a lot of the same gear... I use my V4 with a matching V4 4X12 cab and it gets stupid-loud... Reaches a volume ceiling about 11 o'clock then starts getting grindy.

I usually run with everything at 12 noon, (maybe a smidge more bass), and the volume at about 10 o'clock... Definitely get it serviced for peace-of-mind if nothing else...

My Sunn 200S through the same cabinet also kills, though with that head I prefer a single TL-606... Such a pure tone stack!

-robert
 
#18
I run mine through a pair of JBL K145s (15"s), and don't think I've ever had to play it above 10 o'clock. It's plenty loud, and sounds fab. The only time I really need more power is if I'm doing an outside gig or a no PA support gig with a 5 string EUB.

I've got an SVT for that. :D
 
#20
Yeah, Corey, that's exactly the rig I was running, except my head had black switches if my memory serves me right. Also I had the tilt-back. I don't know what yours is. Not sure there was any significant difference in terms of efficiency WRT drivers used in one cab vs the other. The Ampeg experts here will know. My head ran out of gas trying to make up for the SVT's high-pass nature -- basically trying its best to compensate for that cab's tendency to discard fundamentals. Maybe I was pushing more bottom end in the mix than you are with yours, in order to try to "stay away" from what the other band members were doing frequency-wise. Could be anything. But, glad yours is working out for you.
 

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