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Hi ! I just got two AEG AW2 recorders from 1948-50. One is 19/38 and the other is 38/76. They both use the same chassis and I have no schematic. Anybody has some technical documents on those AEG machines ? I'm also looking for the schematics of the amplifiers used in earlier models like the K3...

Hi, I have a Sennheiser MD21 microphone which I use to make monoral recordings with an old Nagra 3. I'd liket to find the correct base for it, as it's to be screwed on something (see pictures). I'd mostly record piano for my personal use so the base has to be like those used in concerts. I...

Thanks for your replies. I have a few spare XLR plugs, so I could build my own cables. Should I use the following pinout ? http://pinouts.ru/Home/xlr3_pinout.shtml And should I understand the above pinout as being seen on the solder side of the said male/female plugs ? Thanks !

Hi, My B77 is currently back to service so I put a PR99 (read only) to play my tapes in the mantime. The problem is, the outputs are XLR balanced type, and the machine is to be connected to a normal amplifier with RCA plugs. I currently connected the headphone output to the amplifier input and...

Hi, I just acquired a Stellavox SP7 machine, configured in stereo (record / play). It also has a sync head. I'm looking for the schematics of the plug-in modules because as their PCBs are housed into aluminium shields with some resine, which avoids any service, and I'd like to eventually...

The B77 can be converted to rack mount or horizontal operation but you will need to remove the back cover (which contains the whole machine), then put the two bars allowing to fix to the rack, and then put a metallic case around the machine (back / sides) to protect it. Kits are still available...

I used to reject tapes with splices until I was running short of virgin tapes and recorded a live concert on a used tape which I didn't check prior to recording. This very tape has always sound great and I never paid any attention to its condition, until I rewound it and eventually heard a dozen...

They came from Radio France and were used in the 70s, so I got a number of them. Note that I have both types of settings: "Oxyde Exterieur" supposedly for German recorders and "Oxyde Interieur" for international recorders. That's all I know. The backside is pink, there is a number stamped on the...

This is really 262 tape as seen on the picture below. I also have some AGFA SN 401 D but the tapes are always marked RK40D and are back coated. They deposit some white powder on the heads but sound very good. I didn't keep them.

Hi, I salvaged a number of those old tapes which date the 1970s. They have AEG cores and are stored in round metal boxes like films and have a pink backside. I just wanted to know how good they were and what is the closest "modern" tape to see whether they match my bias settings (LGR35)...

Hi, I just wanted to know whether there is a way to allow the 3.75ips (9.5cm/s) speed on my Revox B77MK2, which only does 7.5 and 15. It's a 2-track machine, so it's only meant to play old mono tapes recorded on both side and transfer them in a single pass. Any hints ? Thanks, David.

John: While I didn't real all the replies above, I can tell you that stickiness does happen to unused tapes as well (NOS as we say). This is not generated by using the tapes, but by natural "aging" of the magnetic combination. I too had that problem with a big bunch of 456 tapes (some 150 I...

Concerning Studer / Revox pinch rollers, I strongly discourage you from buying cheap remakes. Some are even sold as originals for cheap, but they aren't. There's a source for that crapola in Italy. Just avoit that ! They look same, but they don't work as smooth as the originals. Better getting...

Buying second hand tapes is ok if you can see or know how much they were played. Sometimes they show little use and can be considered virtually new when properly degaussed. However, getting them and discovering splices, silent sections (tape without oxyde) or even wear from numerous plays can be...

Thanks for this interesting document. I can't find any 1/4" tape which can last 2 hours at 7.5ips. The longest ones are 1100m and last 1.6 hours at this speed. It seems that I will have to do with not-so-reliable tapes, which won't last long or are more fragile :( The other solution is to look...

Hi, I often record radio broadcasts on my 2-track Revox B77 (can't afford a Studer A80 right now). As those broadcasts don't always have advertisements after the last hour to change the tape (I use broadcast tape like PER525/528), I wanted to know if there's any really good and reliable tape...

If your mixer works well, don't bother recaping right now if you don't have test equipment. To see if a capacitor needs to be changed, you have two tests to do: 1) Capacitance 2) ESR (Equivalent Series Resistor) The first one is trivial to test with multitesters. The latter needs a special...

Hello, I got a number of RK-40 pancakes recorded some 30 years ago. These are Scotch / Basf (can' recall the right one as writing this) and I wanted to know how good they are, they will develop stickiness or if the oxyde turns into powder, etc. I checked the two AES tables for BASF and other...

I personally use a Revox B77MK2 at home and for various reasons I prefer it flat than upright: 1) You never know whether the capstan is precisely balanced. I noticed a flat piece of metal which maintains the bell-shaped rotor of the papst motor. This is not evenly placed when locked, so I...

Hi, I recently found a nice little plastic tool (pictured below) which tells you how long your tape lasts by putting it next to the central core (bobbin). This this tool only works with 52 micron tapes like PER525 and PER528, I wondered if anybody knew about a more generic tool like the one I...