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Ampeg VT-40 as a bass amp?

Jul 15, 2016
78
229
31
Montana
I think I might have goof'd today and I figured this would be the best forum to figure out what I did wrong.

A little back story:
I've been trying to acquire a bass rig recently as playing through a guitar amp wont cut it for obvious reasons. I'm sort of a noob when it comes to bass gear so please bear with me. I've sort of set my mind on Ampegs as most of their SVT models (especially the older models) have the nice warm fuzzy drive that I've grown to love. A bit of researching here and there and I decided I wanted at least a 410HLF (Ported gives better low end, right?) and would settle with what ever compatible (and cheap) amp head that I could use until I saved enough money to buy an SVT-3 Pro or maybe even an old SVT-VR. Today while I was back in my hometown to visit family, I decided to go around to the pawn shops and see if I couldn't find something that would suit my tastes. One Pawn shop had an acoustic model 230(neat!). It sounded alright, but I wasn't able to play it through a bass cabinet, just some sort of Peavey Valve King 4x12, so I'm not sure if I heard the amps full potential. The amp also had some odd noise when I turned the pre-volume(?) beyond 12 o'clock and the master volume knob didn't work at all so I ruled it out.
Off to the next shop.
I started to get super giddy when I saw an Ampeg VT-40 sitting under a pile of random cables and junk. I figured it was a bass amp because of a few things; The Brightness button, the treble ultra high [- 0 +] rocker switch and, my general ignorance of thinking Ampeg only made bass amps. So I grabbed my bass from my car and plugged in and started playing a bit and messing with all the knobs to see if it was in working order. As I turned up the amp I noticed a slight rattle that I was sure was coming from the amp its self and not vibrating the junk that was around me (I know how that sounds from playing very loud in my bedroom :D). I looked at the price tag and saw it was $500. After blasting a quick google on my phone I noticed that they usually went for anywhere from $600 to $800 in decent condition. I talked the guy down to $400 and was on my way home with what I thought would be my solution to my lack of an amp!
When I got home I did as any young player would do, Plug it in, let the tubes warm up, and start blasting Geezer Butler and Bootsy Collins Riffs! Oops, the rattle was still there and got worse as I turned it up. I figured one of the speaker cones was torn and popped off the grill, but all of the speakers seemed to be in great shape. After doing the research I should have done, I found out I had just dropped $400 on a guitar amp and my heart dropped. Although the fuzzy channel did sound pretty neat, I couldn't turn the volume up very much before the amp started to rattle and sort of fart out noise. (The speakers did seem to have alright low range though).
Is there a way I can use this for bass, or should I find a way to get rid of the amp and keep looking for a good bass rig? Im kicking my self in the foot for being so hasty and ignorant.

Thanks in advance!

(P.S. I also posted this in the Ask a Pro section, im not sure if thats cool or not but I need any help I can get for this situation)
 

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The VT-40 is a V2 head in a 4x10 combo. Since this isn't the top load version you can pull the chassis out into a head case and run it into a bass cab. The issue will be whether or not a 60 watt amp will be enough.

Fliptops sells repro head cases Invalid Link Removed
 
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What coreyfyfe said. If you pop the amp portion into a head case, im not sure id recommend the 410 hlf. Some love 'em, some hate 'em. Im more on the hate 'em side. If youre sticking with ampeg, other cabs in their svt line might mate better with the v40/v2. Nice thing is, if you put the amp in a separate head case, you can determine for your own ears what works best for you.
 
The VT-40 is a V2 head in a 4x10 combo. Since this isn't the top load version you can pull the chassis out into a head case and run it into a bass cab. The issue will be whether or not a 60 watt amp will be enough.

Fliptops sells repro head cases Invalid Link Removed

Cool thanks for the info :)

What coreyfyfe said. If you pop the amp portion into a head case, im not sure id recommend the 410 hlf. Some love 'em, some hate 'em. Im more on the hate 'em side. If youre sticking with ampeg, other cabs in their svt line might mate better with the v40/v2. Nice thing is, if you put the amp in a separate head case, you can determine for your own ears what works best for you.

Why aren't you a fan of the HLFs? (Just curious, I haven't heard the difference between HLF and HE)
 
I'd sell it to a guitar player and get a bass amp. There are probably aspects to the V40 that make it less than ideal for bass; pre amp desgin, EQ points, output transformer. Having said that I rocked the amp section out of a Musicman Sixty-five into a SVT-410HLF for a few months one time when I was slumming. Not on eBay or Reverb but I've seen old V4/B's for $500.
 
I'd sell it to a guitar player and get a bass amp. There are probably aspects to the V40 that make it less than ideal for bass; pre amp desgin, EQ points, output transformer. Having said that I rocked the amp section out of a Musicman Sixty-five into a SVT-410HLF for a few months one time when I was slumming. Not on eBay or Reverb but I've seen old V4/B's for $500.

It's the same preamp as the V4/V4B amps of the era and the OT was a similar beefy design for its rating so the amp should be fine, the issue is more power rating IMO. Not everyone can work with 50-60 watts. I'd also worry about restoration/recap costs and finding stout 7027A tubes for the 590V (or higher) plate voltage these run, but that's another thing entirely.

A V4/B for $500 would be a rare find these days, not that it can't happen but most seem to be selling in the $7-900 range. There are two on reverb right now for $500 or less, both in non-working condition.
 
It's the same preamp as the V4/V4B amps

Yes, VT-40 would have the same preamp as the V4 but not the V4B. The difference is unfortunately a little bass roll-off in the V4 which begins at 40 hz if memory serves.

A V4/B for $500 would be a rare find these days, not that it can't happen but most seem to be selling in the $7-900 range. There are two on reverb right now for $500 or less, both in non-working condition.

Agreed. I bought a V4 four years ago for $200. It played but needed work. I bought a V4B for $500 a few months ago. Same story, but it did make it through a few gigs first. I just sold the V4 (with a V4 cab) for $1000. Bargain hunting will yield results in time.
 
Yes, VT-40 would have the same preamp as the V4 but not the V4B. The difference is unfortunately a little bass roll-off in the V4 which begins at 40 hz if memory serves.



Agreed. I bought a V4 four years ago for $200. It played but needed work. I bought a V4B for $500 a few months ago.

I've done the coupling cap mods on both of my V4s (current and previous) to bring them to V4B spec, the difference is negligable IMO. Use my V4 strictly for bass.

I just bought another one, a little over $200 and definitely will need some work to get going but planning to flip it when I'm done.
 
I've done the coupling cap mods on both of my V4s (current and previous) to bring them to V4B spec, the difference is negligable IMO. Use my V4 strictly for bass.

I just bought another one, a little over $200 and definitely will need some work to get going but planning to flip it when I'm done.

Maybe someone here is interested in this for $299:

[Invalid or Expired Link Removed]
 
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The VT-40 really is a V4 family member with some minor tweaks. The B25 pre is similar to a B-15 but with 12AX7 tubes instead of 6SL7's. The B25 power amp is closer to a V4 but with a different phase inverter and only two output tubes.

The B25B power amp was basically an update on the B18N (and B15NC/D) power was it not?

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The B25B power amp was basically an update on the B18N (and B15NC/D) power was it not?

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Yes, that's true. The 7027A and 7199 phase inverter was a building block that they used in amps such as V3, B12XT-B18X, B12XY..., B22X, B42X, etc. The V2, V4, VT-22, and VT-40 are based on the same design.

It's interesting, Ampeg offered so many different amps. One way of being so prolific was by adopting proven building blocks that were used in previous designs.