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About topoxforddoc

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Personal Info

  • Location
    Cheltenham, , United
  • Real Name

Wigwam Info

  • Turn Table
    Platine Verdier
  • Tone Arm & Cartridge
    Schroeder Reference
  • SUT / Phono Stage
    TRON Seven Reference
  • Digital Source 1
    Studer A820
  • Digital Source 2
    Sony APR5003
  • DAC
    Otari MTR12
  • Pre-Amp
    TRON Meteor
  • Power Amp/s
    TRON Voyager
  • My Speakers
    Avantgarde Duo
  • Trade Status
    I am not in the Hi-Fi trade

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  1. topoxforddoc

    Stirling LS3/5a 11 ohms - Matching amplifier advce

    If they are the original V1 Stirlings with the T27 and B110 drivers, they are fantastic. They made very few pairs - all with serial numbers starting 88XXX to suit the oriental market. I bought a pair when they came out and still have them.
  2. topoxforddoc

    Richard Dunn

    I never met Richard, but losing such a knowledgable man is big loss to the audio community, but leaves a far greater gap with Nadia and his family. RIP
  3. topoxforddoc

    Thinking of Lodgesound (Stewart Emmings)

    James, indeed Stew was an oracle on many matters. Our technical loss pales into comparison with that experienced by his colleagues at the BFI, where he was chief video archivist, as well as the guy, who maintained many of their vintage machines (tape, video and film).
  4. topoxforddoc

    Thank you to 29mile

    The eye is deceived by an ultra wide angle iPhone lens. Yes the arm is a tiny bit tail up, but the Allaerts MC1B has an exotic Fritz Gyger S stylus profile. Hence you need a stylus rake angle of 92 degrees or perhaps a tad more to get the contact area perpendicular to the groove. Having played with this now for a couple of days and listening repeatedly, the cartridge just opens up and almost becomes holographic when the tail is up very slightly.
  5. I haven't posted here for a while. But I thought you might like to see Stew's Otari MTR12 in action. He bequeathed this to me, after he passed away almost 2 years ago at the age of 49 from bowel cancer. This machine belonged to Dave Stewart at Church Studios. I feel very honoured to be its guardian. Here it is playing a copy of the distribution master of George Michael's Faith - Father figure - seems rather appropriate, as he taught me everything I know about tape machines.
  6. topoxforddoc

    Thank you to 29mile

    Mervyn (29mile) advertised his Schroeder Reference 9 inch cocobolo 3 weeks ago. Sadly, his sales thread got a few unhelpful comments, which led to the thread being withdrawn. Anyway, as a long standing Schroeder owner (Model 2 bought 15 years ago), I could tell that this was genuine and one of Frank Schroeder's older Reference arms. Thankfully, Mervyn made the transaction painless, apart from exchange of copious beer chitties. Graham Tricker at GT Audio kindly supplied me quickly with another armboard for my Platine Verdier along with the correct length M4 mounting bolts. My Schroeder Model 2 has been retired temporarily and the Reference has assumed its position on my PV along with an Allaerts MC1B. Needless to say, after an afternoon setting this up, the MC1B now sounds really sweet (and significantly better than my Model 2). I couldn't thank 29 mile on his sales thread, so I felt that it was right and proper to do this in another way.
  7. topoxforddoc

    R2R rules, yeah!!!

    My recent purchase Blondie - The Complete Picture Jugoton Production Master - 15 IPS 1/4 inch tape
  8. Philip, This will make me look again at Stew's MTR-12 in my sitting room. I'm sure he's up there getting his mitts on something electronic or mechanical RIP Charlie
  9. It's a pleasure Rick. Glad to hear that the show went well in spite of the weather. Philip and I chatted about the show shortly after Stewart passed away. We met up a few days ago at my home, so that he could collect some of Stewart's tapes to play at the show.
  10. Perhaps you could have made a helpful suggestion to Philip (The Reel BBC) about how to embed the images, given the fact that he only has 5 posts to his name (that's a rhetorical suggestion).
  11. topoxforddoc

    Setting up a R2R tape deck - part 1 - Repro (playback)

    Hi Henry, Thanks. All well in Cheltenham. I have sent you an email about the RTS2/ATU1. Happy to come by and collect at some point later (I'm not going to the Audiojumble) Best wishes, Charlie
  12. topoxforddoc

    Setting up a R2R tape deck - part 1 - Repro (playback)

    Serge, I use PPM meters for setting up a fixed replay level at PPM4. On record, I would normally use the PPM meters to set the record level at PPM4 using the test tones. But I would then use the on board ANSI VU meters to set the bias, as the markings on PPM are too wide apart at 4dB and one can't really interpolate the gaps accurately. Charlie There'll be another post on record set up later
  13. topoxforddoc

    Setting up a R2R tape deck - part 1 - Repro (playback)

    Serge, Thanks. I gather that the topic of metering is a bit controversial. I have ANSI VU meters on my Sony APR5000s, Studer A820 and Otari MTR12. However, Stewart told me that the broadcast industry in the UK lined up all their machines to BBC spec using PPM, as lining up to exactly PPM 4 was more accurate than lining up to -4dB on a VU meter. I take your point about using an audio millivoltmeter, which would be 0.775 V at PPM4/-4 dB on VU. I do use the VUs for setting up bias on a tape formulation, as the PPMs are too wide to permit accurate level of over bias on a tape. Finding an old Ferrograph RTS2 is not easy, but maybe I'll just to go hunting. Charlie
  14. After Lodgesound (Stewart Emmings) passed away last summer, I was asked if I might pass on some of his knowledge in due course. I was a complete tape novice before Stewart taught me the basics. I'm sure that there will be some on this forum, who will know far more than I do. Stewart worked in broadcast for his whole career, at the BBC, C4 and then at the BFI, where he was in charge of video and audio restoration. He and his best friend Mike restored the sound tracks and pictures on Hollywood film re-releases, TV programmes and numerous other material. In a standard 3 head machine the tape passes over the erase head, then the record head and finally the repro (replay) head in that order. That means that the repro head monitors the signal, which you have just recorded onto the tape. Hence when lining up a tape deck, you need to set up the repro head first. Equipment needed: you need a test tape, PPM meter, oscilloscope (and a tone generator, plus a new tape - for the record set up, which I'll describe in another post later) Before starting clean the heads and tape guides with a lint free wipe/cotton bud with a small amount of isopropyl alcohol. Demagnetise the heads, if the machine hasn't been demagnetised in recent memory. The first step is to check the repro head azimuth against a test tape. This is really important, as incorrect azimuth cannot be corrected in later adjustments. Incorrect azimuth leads to poor sound quality, esp losing high freq leading to muffled sound. 1) You need a test tape and a scope to set up repro head azimuth, plus a small allen key to alter the repro head azimuth if needed Load the test tape. Connect up the R2R outputs to Ch 1 & 2 of your scope and set the scope to read X-Y (Lissajous). Play the 10 k tone and look at the scope - a perfect azimuth should give you a sharp focused line at 45 degrees (should look like this /) - if the azimuth is incorrect you will have an oval trace - adjust the azimuth on the repro head until you get a perfect 45 degree line Once the azimuth on the repro head is correct, you now adjust the repro output levels to give you a flat frequency response on replay. 2) Adjust the repro levels on playback (repro) head. Load the test tape. Connect up the R2R outputs to an accurate meter, preferably a PPM meter (much better than VUs, which were known in the BBC as "virtually useless"). If you use the internal VUs on the machine, you may find that these are not accurate enough. Play the test tape 1k test tone and adjust the repro level on Ch1 (using a tweaker or small screwdriver on the repro control panel - read your instruction manual to find out where this is) until you get the correct reading on the PPM meter (usually PPM4 = minus 4VU = 0dBu). Do the same for Ch 2. Repeat the process as above for 10k tone on the high freq repro level adjustment on the control panel. Repeat the process again using a 100 Hz tone on the low freq repro level adjustment on the control panel. The repro side of your machine should now be lined up properly with a flat frequency response (if you want, you can repeat these steps on a series of other test tape frequencies and check it with a sweep test tone). I'll do the record section on another day. Charlie PS I specifically didn't make any reference to particular test tapes, as it depends on your machine, the tape speed of the machine and what reference flux you want to set your machine up for. Choosing a test tape is a whole chapter in itself. If you are interested, then the bible on this is the MRL reference guide.
  15. Positives: learning so much about setting up reel to reel tape decks and opening up a completely new vista to my listening. Negatives: losing my R2R mentor, Stewart Emmings (Lodgesound), during the summer at the age of 49