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For the last 20 years I used Shure PGX which was serving me well with solid sound, but recently got a lot of dropouts due to... I play in forbidden 5G/LTE range. No one does change frequency on these units, so it's goiing to trash. I wanted to buy another one, almost bought AKG WMS40 because its...

Does anyone know to what exact value they should be biased? (And where are the bias points, btw)? The 3PRO is 24mV across the mosfet resistors, but since 3pro is different construction, less power etc. it may be different. I can't find any info over the web. Thanks in advance!

I've got two SVTs on the workbench, two of same problems - weird voltages in the preamp section. See preamp voltages I got from somewhere: Now in mine: V1 / pin1= 365v, pin2= 230v, pin3= 240v, pin6= 230v, pin8= 2v V2 / pin1= 240v, pin3= 2v, pin6= 300v, pin8= 2.6v V3 / pin1= 150v, pin3= 7.3v...

The question was asked before, just when the special edition appeared but it seems no one knew it back then. It's advertised that 1srt channel is modeled after blueline SVTs (69-71) and second channel after 1975 models. Is this only a marketing thing? Because I don't see any differences in...

Calling all pre-CBS specialists! I disassembled my '64 P to see if its really a "refin". Well it looks like, but the paint job is VERY old for sure. When I bought it I've been told it's a refin, but could it be a "factory refin"? I see no "ES" stamps. I've already asked the best specialist here...

I have two '69 B15Ns on the bench. One is my beloved one (from profile pic!) and one is a new one. I have recapped it the same way I did the old one. Nothing messed up with ground positions etc. Changed 100uf bias cap, put 20k pot in series with 33k resistor to have variable bias. The case is...

I don't know where to start... but - does anyone of you know when Fender did sort of mistake in the arm contours in P-basses? I almost bought a '65 P last week (refin) but it haven't got that bump so I decided to search again. Today with a bit of free time I've done research and found 50/50...

I have on my workbench early 00s SVT-CL that was given to me in the "original" shape. I'm sure it wasn't even opened once. The amp has steady 50/60 cycle hum that is not the "end of the world" but it's two or three times louder than my other CL and Heritage I have here. This hum is not related...

I have never worked on early 60s B15N, but have this baby on my workbench right now. Just a quick question - tubes get 60mA (per tube) when in fixed bias B15N it's around ~35mA range. Isn't it a bit on the high side? I know that cathode biased amps would have higher bias but 60mA seems super...

Is there any place I can get *empty* B15N transformer cans like these? (or maybe someone has got the fried - or working - PT/OT, I would be interested)...

Coming soon: Ampeg Heritage 50th Anniversary SVT

I'm in the process of restoring early 70s SVT which someone had done a little mess inside. The back standby switch was disabled (cables cut) and polarity switch was disabled from its funtion and (what I think and 99% sure) someone tried to wire polarity switch to function as standby so it would...

Guys, I have never played through a compressor. Never needed one. My path is simple. Zvex Hard-ON, Death by Audio fuzz for the distorted sounds and vintage ampeg tube amps (SVTs, V4s, B15). However I have '68 Tele bass with single coil pickup which cannot be set to ideal string balance. That...

OK, I worked on many V4/V4B amps before but I don't know what's going on. I have late 70s master volume V4 (not a distortion model). Amp has new caps, bias pot added etc. Sounds great but when I turn master volume up it hums. The more I turn master volume up, the more it hums. - it hums with the...

I have been digging a lot for the info about these basses and what seemed strange is pickguard for the single coil tele basses made between 1968-1971 only. Pickguard "disintegrates" killing/oxidizing metal parts like pickup, strings & frets. I found dozen info about that over the internet. It...

I've got late 60s B15N that I borrowed and guy has broken two d-shaft pot endings. Tried to glue them, but no success. I looked at fliptops.net and they do not have replacements. Is there any place I can buy them?

I have strange problem with my B15N (I think it's a 74 - silverace w/blacklining, chrome switches, CTS speaker) - amp sounds great, no hum, awesome sound, no scratchy pots etc. Bias and all the tubes were checked (I even changed all the tubes to be sure). Sometimes when I push amp really hard it...

OK guys. I have been soldering new speaker cable to my 70s B15N and wanted to ask where on that switchcraft 4-pin connector (from left to right: 1,2,3,4 pin) is [+] and where is [-]? the pins #1 and #4 are speaker connections as I see, but no knowledge about +/-....

I have bunch of matched KT88s lying around and I have tried it in SVT but can't get bias to work well. With 6550s I can easily set desired .075V per side, but with KT88s I get .030 or something like this (maxed out potentiometer). Do they need different biasing, if yes, what value I should get...

I've probably read every B15 "replacement speaker topic" over the web in the last weeks. My '69 B15N CTS speaker is blown. - I have asked Weber - they recommend "Bass15F" (175w, ceramic) - I have asked Fliptops - they recommend Eminence Beta15a - Some people here swear for Delta 15a as even...

Guys, I recently bought a vintage p-bass and the tortioise shell picguard is well shrinked.. it bends there and there. Is there any known solution to flatten it down? I mean, with aheat machine or something like that?

I recently got a 51 CS pbass that has a "stacked" duncan pickup. This is my first CS bass and first ever with a single coil "early"precision style (i have vintage pbasses with spli coil pickup so every one is post 59). The question is - it does not have good balance between the strings. It is...

Well. I have never found that answer. Why some SVTs, V4Bs etc. were in silver AND in black (I mean, grill cloth)? I think it happened after Magnavox took Ampeg (1972) that some of them had black grilles and some silver/blue (before that only s/b). Is it a random thing or they did it like one...

I recently did it in a 3-day live recording session because we were recording live in the same room and it was just too loud for crunchy V4 sound. We did removed outer tubes and put the ohm selector to 2 ohms (running 4ohm cab). Is this safe, let's call it, "mod" for that amp? Does it hurt the...

...to have the most clean headroom? I know it does not have the bias pot (I'm planning to add one), but what bias setting you recommend? 35mA? Maybe less for more clean thump? I've got original Magnavox 7027A tubes in mine.

I know that early 70s V4B can be rewired to 230V like most SVT's. Is there any online "pic-by-pic" manual to do it? I know that you must probably solder together a pair of wires coming from the OT, but, you know, I don't knowthe details.. I'm not electrician, does not have the knowledge to read...

I'm looking for the info about the how much the early 70s V4 need power. I need to get an external power transformer. Could not find any info on google. There isn't any info on the amp back itself... is 300W OK for this amp's power consumption? I've also read (ampegv4.com) that some models had...

I have owned and played almost every single 8x10 cab that Ampeg had made. They all are very different. My favourite was the late 70s model and the MTI with squareback eminence speakers (for me, these cabs were sounding the same). Everyone is raving about the squareback svt's. they are indeed...

It seems that combination is possible. How about bias? The question is why- just to be good for lower volume gigs and small cabs under 200w.

I'm looking for that old school CTS tone in my B25 2x15'' cab. Need to pair it with v4b (maybe svt?). I've been reading about Emimence Beta's and Delta's that sound similar to CTS. But which one? Or maybe there is a better choice? BTW, Is it safe to pair old SVT and the 70s 8x10 240w cab? I...

I recently acquied Ampeg B25 cab ('ve benn told it was bought in 1969) with 70's replacement speakers Electro Voice 15R series II (200w each). As I found out there was some factory replacements for the CTS speakers over the 70s Linden/Magnavox era and there were Altecs and EV's as a factory...

I have '77 P Bass. A-neck, a little flame maple neck, grey back pickups. Sound of this bass is very bright, edgy. I've tried to use heavier string to get more deep, standard, p-bass tone, but no effect. I wonder what pots are inside (or resistors) of late 70s basses. If they are 500k should...

I had problems with keeping the volume down with my MTI SVT on almost all shows. Almost all the time "too loud on stage" and I was like on "1" on the scale... One time someone suggested inserting volume pot between preamp out and power amp-in, so this will behave like real master volume. A...

MY fan is very noisy... (sounds like a vacuum cleaner!) Are there any exact size/voltage/pinout replacements which I can buy? (in Europe too?)

Guys, 've been searching for an hour here for info about the layout of svt preamp and what tube does what (I remember seeing it here somewehre) I mean V1-V5. V1, V2 = channel 1 ??? V3, V4 = channel 2 ??? V5 - summed output of the preamp for both channels? Is that right?

Guys, can I use the test points without the scope? I mean I biased a dozen of amps using kind of Weber bias meter (attached between tube and a socket) + voltage meter and calculated bias from known formulas. And wanted to know if the SVT's test points should show the same readings connected...

I would like to know if there's possibility to switch the voltage to 240V? I know that these units were made in Japan in the 80s. (Voltage in Japan is 100V, USA-120V, and Eur-240V.) I had '76 Magnavox SVT and the transformer was easily reconnected from 120 to 240V... :confused:

Guys, I need your word about reamping. I know the pros, but what are the real cons of it? I mean, loss of signal, different (worse) sound? It would be done thru vintage Fender Precision, then Mackie analog mixer, MAcPro - Logic9 and then, after all, send thru Orange AD200 & vintage 810cabinet -...

Hello Tried to have these questions answered on Orange forum, but they're not talking about "voltage" things... so.. I wrote my ad200manual (Invalid Link Removed) about half year ago and since that time I haven't found answers on many my questions. I've been searching everywhere to find...

I heard that on 2nd May in Cologne, Germany there is a huge market of used instruments going in the centre of the city? Could anyoone tell me that is true (I hard this is only set twice a year) ? I'm going to look for a B15 and will be aroung Cologne on 2nd May..