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Ampeg V4 Club

#821
I think it's safe to assume they're the same freqs. I know for a fact the bass is. The treble, ultra-hi and ultra-low sound identical to me, too. No idea about the Q but I have to assume it covers the same ranges the old ones did. But I can't remember the freqs offhand and I'm too lazy to look them up. There is a V4 website that should have all that info... www.ampegv4.com .
 
#822
JimmyM said:
I think it's safe to assume they're the same freqs. I know for a fact the bass is. The treble, ultra-hi and ultra-low sound identical to me, too. No idea about the Q but I have to assume it covers the same ranges the old ones did. But I can't remember the freqs offhand and I'm too lazy to look them up. There is a V4 website that should have all that info... www.ampegv4.com .
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Na, no luck on ampegv4.com. I searched the forum, but no success. Only thing I found was this old TB thread: http://www.talkbass.com/forum/f15/ampeg-eq-598171/ - but again no luck there.

Does anyone else know about the bandwidth for eq section of the old (or new) v-4b?
 
#823
jpc said:
Na, no luck on ampegv4.com. I searched the forum, but no success. Only thing I found was this old TB thread: http://www.talkbass.com/forum/f15/ampeg-eq-598171/ - but again no luck there.

Does anyone else know about the bandwidth for eq section of the old (or new) v-4b?
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Mids are 300/1K/3K on both. The schematics show the circuits are basically identical (V4, V4B). The V4B has larger caps on the input gain that allow for a lower cutoff at the input so you'll have a deeper tone to start with, and the V4B has the ultra low boost instead of the sensitivity, but otherwise the resistors and such around the circuits are all the same. A few pictures I found via google image search show the same values on the V4B faceplates ([Invalid or Expired Link Removed], 2) as the [Invalid or Expired Link Removed]. The manuals available on ampegV4.com indicate the mid range control is either 300/1K/3K or 300/800/2.5K but doesn't say which amps have what. The service manual I have for the V4 says the bass and treble controls operate at 40 and 4K, probably the same on the V4B as well.
 
#824
coreyfyfe said:
... The schematics show the circuits are basically identical (V4, V4B). ...
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I was asking about differences between original and reissue of the V-4B. Sorry, if that wasn't clear from the posting. But it seems both are similar frequency-wise.

But what I'd really like to know is, what is the bandwidth (or Q factor) for the EQ section of the new or old V-4B, like for bass, mid, treble, ultra lo and ultra hi :confused:
 
#825
jpc said:
I was asking about differences between original and reissue of the V-4B. Sorry, if that wasn't clear from the posting. But it seems both are similar frequency-wise.

But what I'd really like to know is, what is the bandwidth (or Q factor) for the EQ section of the new or old V-4B, like for bass, mid, treble, ultra lo and ultra hi :confused:
Click to expand...

Sorry, usually the question is between the V4 and V4B. Anyways, the answer is the same. On the vintage amps the frequency centers are 40 Hz for bass, 300/1K/3K for mids, and 4K for treble. The ultra high is a cut/boost at 8K, the ultra low is a cut at 40 in the (-) position, a cut in the low mids (~5-600Hz) in the (+) position. On the reissue they're as you posted earlier. Pretty comparable overall.
 
#832
Can I join? I purchased this v4b in 1996 for $200. It's been my main amp since. I run it with 2 410he cabs.
IMG_0549_zps761a8926.jpg

IMG_0547_zps0d84942c.jpg
 
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#834
Been refurbbing my "new" V4, thought I'd share some fun gut shots...

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This amp was nearly stock when I got it. Missing two screws on the chassis, missing a nut on one of the jacks, and had non-sylvania/ampeg tubes, otherwise it was pretty much how it came from the factory. New electrolytics and power resistors, a few other caps (replaced those big, gross looking .47 uf caps), new power light, a handful of out of spec resistors, some other coupling caps, plate and screen resistors, replaced the 12AX7 that was residing in V3 with a proper 12DW7, etc. After a few weeks of play I got a nice pop and then weird sputtering. One of the nice RCA 7027s that were in this amp decided to take a dive. A new set of sovtek 7027s and we're back in business.

I ended up adding in the grid stopper resistors that are shown on the schematic with the "*may not be placed" tag as I was picking up a ton of radio noise with this amp. I went with 1K as the schematic calls for at first and it killed most of the noise, but there was still a little bit. Just upped them to 56K, so we'll see how that goes at rehearsal on saturday.
 
#836
Bass 45 said:
You know the trick of leaving the rear panel on when tinkering with a V4 - it took me a while to figure that one out;)
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The first time I had it out it was just balancing and I was like, okay, this might work. Then it fell over. So I'm trying to get the thing back into the headbox when I thought it might be easier if the back panel was on. Then it hit me that's how you're supposed to do it. Definitely a "what didn't I think of this sooner" moment ;)
 
#837
coreyfyfe said:
The first time I had it out it was just balancing and I was like, okay, this might work. Then it fell over. So I'm trying to get the thing back into the headbox when I thought it might be easier if the back panel was on. Then it hit me that's how you're supposed to do it. Definitely a "what didn't I think of this sooner" moment ;)
Click to expand...

I went through a similar process. At one point I even cut a couple of blocks to rest it on - when I realized all I had to do was leave the rear panel on, I felt like a dope.:rolleyes:
 

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