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Here's a cleaned-up version of what I originally posted:

On 4/11/2019 1:34 PM, Paul Stamler wrote:
> On 4/11/2019 9:21 AM, Karl Miller wrote:
>>   While not totally pertinent to your note...I am reminded of the 
>> Everest release of Grofe's Atlantic Crossing. The original release was 
>> on a London LP When released on Everest, it was at least a half step 
>> sharp...50 versus 60 cps? At any rate, the Everest release made the 
>> narrator sound like a cartoon character...which was not all that 
>> inappropriate as the story line was pretty ludicrous.
> 
> It probably wasn't a line-frequency issue; 60Hz is 20% faster than 50Hz, 
> which is more than 3 semi-tones, which would have sounded ludicrous.
> 
>> This is not tape drift- a problem encountered on old tape masters- the 
>> Ampex
>> 350 was prone to this problem- when splicing together the end  of one eel
>> with a segment from the beginning of another or if done on two recorders
>> should they have been running at slightly different speeds..
> 
> Which they usually were;  Ampex 350s (and 355s and non-servo AG-440s) 
> would notoriously run at different speeds at the head and tail of a reel.

> I encountered speed issues on the Folkways LP "Music and Songs of Norway"; 
> every track was a different speed. Fortunately, a lot of them included 
> background 50Hz hum, which I was able to use as a reference. The record 
> sounds a lot better with the speeds corrected.
> 
> I had a similar problem with the Vanguard LP "Mississippi John Hurt's 
> Greatest Hits", which was actually a live concert recorded at Oberlin 
> College. I'd always thought this was one of Hurt's more lackluster 
> albums, as if he was having an off-night. I found some 60Hz hum on that 
> recording, which turned out to be significantly slow. I assume that the 
> recorder which captured the original performance (it belonged to the 
> campus radio station) was running a little fast, yielding proportionally 
> slow results on Vanguard's cutting-room playback decks. When I corrected 
> the speed so that 60Hz was really 60Hz, the performance was similar to 
> what I heard on Hurt's (post-"rediscovery") studio albums.
> 
> Peace,
> Paul
> 

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