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Everything posted by Tunes

  1. 1/4 Track Playback Head On A Nagra IV-S ?

    This is a great mod for those who mainly use the IV-S for playback and have no use for the pilot/NRS function. You have a ballpark of what the mod cost and is it reversible (What is the extent of light machining)?
  2. Great post! Always interesting to better understand what led to the development of these amazing machines. Love the photos.
  3. Seems to have already sold for the US$6k asking price. Wow!
  4. I was watching this in hopes I might get lucky. No such luck! Beautiful machine but really surprised me that the auction went that high so I was out very early. Hope the winner is able to get it operating.
  5. rescued from the dumpster

    Good find! Amazing what ends up in dumpsters!
  6. Yes, I'm watching that one. Seller does not know much about tape recorders - looks to be more of an estate / antique vendor so a bit of a crapshoot as to whether this unit has any functionality other than as a collectible museum piece.
  7. Also don't want to deviate much more from the thread but for those curious about the difference between the IV-S heads (wide vs standard), there is a current ebay listing for an IV-S with a second set of heads which happen to be the wide-track ones. Not really noted in the description as anything special, but these wide-track heads are desirable among some folks. I have nothing to do with this listing and find the asking price too high but it does include these heads which are probably worth about $1000 on their own. https://www.ebay.com/itm/1-Owner-Nagra-IV-S-Stereo-Reel-to-Reel-Recorder-w-lot-of-accessories/263466035000?hash=item3d57cca738:g:bEsAAOSwZ11ab49P
  8. Thanks for the info Glen! I'll follow up with you and Steve directly. So great to see the parts and expertise are still available to keep these great machines running!
  9. Glen, Do you know if the bias board for wide track heads is available still? I have a set of wide track heads I would like to install on a non-wide track IV-S. Many thanks Chris
  10. Any ideas on helping this novice identify noise on my recent used taudio? I'm trying to diagnose a hum/buzz on both channels on a nagra t audio tape player. The transport is working fine and audio output is strong on both channels but there is a faint mosquito pitched buzz that increases in loudness as volume dial increases. Present on both headphone and via external outputs to audio system. Have had a suggestion that i may need to look at the power supply filter capacitors. One other thing if you know this machine, is that the buzz stops after a few minutes when the unit has not been touched and switches itself into standby. Would this indicate a specific area of the power supply to investigate? Sure hope to identify the culprit as it's an amazing machine otherwise! Thanks! Chris
  11. Buzzing on nagra taudio

    Marc, Your description sounds like what happens to us as we age as well )) Yes, i have a second parts machine which i am using to try swapping power supply units, also did swap the main audio control logic boards but no difference. I haven't tried swapping the left and right audio boards with the parts l/r boards yet as the noise is present on both channels. Still working through the possibilities ... Thanks for all the suggestions and the follow up comments jay and marc. Chris
  12. Buzzing on nagra taudio

    Thank you all for the suggestions! I swapped in a power supply from another machine that has no buzz/tone and that made no difference so now i am thinking it may not be power supply afterall. There is no separate mono head and the mono led is not on so i am thinking it is not due to mono / pilot tone. Have tried two tapes from two different machines and it's there so i don 't think it's on the tape. When in stop, the tone/buzzing persists. As mentioned, it does disappear after 3 minutes in park if the keyboard isn't used and the machine goes into standby. Maybe grounding issue. It is more of a higher pitched tone / buzz than a low steady hum like i've heard on other gear when ground loop hum has been present. Chris
  13. Nagra IV-S question (time code)

    Tony, 60hz strobe arrived safely yesterday. Will install tonight. Hope the 50hz has also arrived there. Many thanks Chris
  14. Pete Seeger - RIP

    Sad to lose one of the great musical and activist icons of the past century. May he, his example and his music continue to inspire.
  15. Nagra IV-S question (time code)

    Thanks for your insights Tony and Glen! Glen, videos would be super helpful coming from such a nagra service tech like you. Wow, that is a generous gesture and shows a love of these machines and interest in keeping them operating correctly into the future. If there was ever a "intro to maintaining your iv-s" as a live/skype training camp, i'd be the first to join and pay tuition! Chris
  16. Nagra IV-S question (time code)

    Tony, Strobe posted this AM. Chris
  17. Nagra IV-S question (time code)

    Tony, Found a copy of exploded view. Thanks for your kind offer though. Didn't have a chance to pack up the strobe yet but tonight i will have time. Also confirming that I'll include the set screws. Chris
  18. Nagra IV-S question (time code)

    Thanks Tony. I took the knobs off last night and removed a layer of grime. Also found a green felt disc (is this standard?) under red knob only which i removed and the clutch disengages more easily now (previously, it was always engaged). Will remove my 50 strobe and post it to you tomorrow. Anyone have an exploded view parts diagram for the iv-s? I have the operating manual and schematics photocopies but an exploded view would help with some of the assembly disassembly process. Enjoying tinkering with this engineering marvel Chris
  19. Nagra IV-S question (time code)

    Tony, Thanks for the links. I've been on holiday and off-forum ))) Happy to swap strobes with you if you're still interested. Let me know. I have a question re cleaning lubricating the volume pot knobs. I would like to remove tge knobs and clean out gunk behind/underneath and relube. Note there is a hole on side of each knob which i am assuming houses some kind of set screw. Question is, if i remove the knobs, is there anything i need to worry about when i put it back together For example, do the knob clutch that gangs them together need to be activated/unactivated, etc? Any spring clips ti worry about? Thanks! Chris
  20. Nagra IV-S question (time code)

    Thanks Marc! Good to know. I found the owners manual online but still wondering about what needs to be switched to run properly in NAmerica other than power unit fuses. If i record and playback my own recordings, i can keep ccir so long as i learn what tape the machine was last biased to right?
  21. Nagra IV-S question (time code)

    New to jwsound. Just bought a nagra iv-s non-pilot ccir and looking for advice on service and parts. It was from belgium and i'm in canada. Any adjustments needed to the machine other than swapping power adapter fuses to run it on 120v ? I have a replacement 60hz speed strobe to swap with the installed 50hz one. Any suggestions on calibrating the speed and bias or who can do this would be welcome. I've been reading different posts about tape stock but still uncertain as to what i should buy. Will be looking for a new modulometer as mine is a little mashed up with cracked glass but works. Also will be lurking for any reasonably priced QGB with hubs to expand the tape and playback options. Good to have landed here. Seems a place i will learn from and hopefully can contribute as i can. Chris