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Messages - cvandyke

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General Discussion / Re: Full track playback with two track heads
« on: May 21, 2018, 08:30:11 AM »
I did receive it but haven't had a chance to try it. I'm in the process of moving and somehow misplaced it. Grrr. I'll report back when it turns up.

General Discussion / Re: Full track playback with two track heads
« on: April 24, 2018, 12:18:52 PM »
This might work:

I ordered one and will report back once I have a chance to try it out. It ships from the UK so it may be a few weeks. The total cost was about $6.

General Discussion / Re: Full track playback with two track heads
« on: April 18, 2018, 09:19:05 AM »
Thanks! I didn't particularly like the bass on the mono tapes I played and I hope this is the cause. The tapes are production masters which contain transfers from 78 sides so it's just as likely be the recording.

Another question about this general subject: is there a reasonable way to determine if a tape labeled "mono" was recorded as full track or two track mono? The tapes I have so far are labeled so it's clear but it seems likely I'll face this issue in the future.

I do have a mono repro head for my deck (Otari MTR10). I need to mount it and to figure out how I want to handle routing the signal from the head. I really don't want to make any non-reversible changes, have an awkward cable dangling, or put a switch in the signal path. I've already spent some time pondering how to proceed and, so far, I've come up empty.

General Discussion / Full track playback with two track heads
« on: March 20, 2018, 08:45:23 AM »
Would there be any negative sonic effects of playing back a 1/4" full track tape with a two track head? Obviously, you don't get the benefits of the whole recorded width of tape. Are there any other downsides?

Reel to Reel Tape Machines / Re: Otari MTR-10 U problems!
« on: December 01, 2015, 08:45:36 AM »
If you still need help, I can look at my MTR-10. Just so I understand your post, you are trying to figure out where two wires from the power supply at the bottom of the machine connect? If some of the logic circuits are not receiving their power, I would expect some wacky behavior so I think it possible this would explain your problems.

I've got the first two scans done and both are overviews which contain large blocks that refer to another schematic page for a component level schematic of that block. I've put the schematics at and I'll maintain this for the foreseeable future. Some parts of the scans are a bit hard to read but they are that way in the original.

The two scans are:

 "Audio control assembly" (

 "Tape transport Assembly" (

If anyone has an urgent need for a specific schematic, please let me know. The best way to refer to a specific schematic is by part name and number if it's known. On the schematics above, component level schematics are referenced in this manner in the largest type size.

I was wrong about the VU lights in that they are powered by 7 VAC (not DC).

Looking over the schematics, I believe the tape lifter solenoid is labeled "shifter sol." on the "tape transport" schematic and is connected to "mother PCB assy" so I'll scan that one next. I'll also put the "power supply hookup pcb assay" and "power supply PCB assy" at the top of the list.

I do have the schematics but had trouble with my scanner so I'll need to deal with that first. Since there is some interest in copies of these, I'll make scanning the schematics a bad weather project. I certainly support making these available.

My manual covers the MTR-10II and MTR-12II and there are separate schematics for the 4 and 2 track models where they vary (eg the meter bridge). The schematics are printed on thin paper and some of them have torn loose from the binder so, as I said before, I'm not sure I have the complete set. I've seen other manuals where all the schematics were missing. I suspect that an engineer may have purposely removed them from the manual to keep them safely on file or perhaps to keep them away from someone in the studio who damaged other equipment.

Mark - if you lost the lights to your VU meters at the same time as the LEDs, I wonder if your 7.5 VDC supply is out (maybe it's 7 VDC, I'm at work and the schematics are at home). I had to replace those bulbs and as I recall they are connected between 7 VDC and ground without any switches or other circuitry in between. I'll scan the relevant schematics for you a soon as I can.

I don't know of an online source for schematics.

I do have an MTR-10 manual with schematics and could scan the ones you need assuming I have them - I'm not sure if my schematics are complete or not. I'll make an attempt to look tonight when I'm at home and see how many pages the two areas you need cover. Some of the schematics are fold outs that cover multiple pages so that could be a complication - my scanner is limited to 8.5 X 11 inches. Scanning all of the schematics would be a project that is too big for me to take on right now.

I've had to deal with many burned out bulbs in my machine so, unless they all went at the same time, it might just be the bulbs are all open. Did you test the bulbs yet?

--Chris Van Dyke

Reel to Reel Tape Machines / Re: What hardware are you using?
« on: March 15, 2011, 08:19:24 AM »
I'm currently using an Otari MX5050BII direct to a seduction-like tape head preamp. I'm working on an Otari MTR-10II which I have fully functional but still tweaking. I have a mostly built Eros preamp to go with it; hopefully both will be done soon. Oddly, Otari machines keep showing up for free or very inexpensively and I can't seem to turn them away. TP subscriber.

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