Comments for page: RCA Dynagroove

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Posted by Robert from NJ October 17, 2012 - 11:16 am
Hi Steve. Your kind comments are much appreciated. Thank you.
I recently hit a bonanza on ebay...a 6-record boxed set of dynagroove records that were never played...for $10.00!!!
It was a Reader's Digest issue that has numerous artists, mostly the typical easy listening genre popular in the mid-60's...Peter Nero, Chet Atkins, Marty Gold Orch., Al Hirt, etc. I will try to get my computer-savvy college grad daughter to help me make some inner-groove recordings to MP3 files...I don't know how to do it myself...if it isn't reel-to-reel or cassette, I'm helpless!! There are literally hundreds of Dynagroove, Command, and London Phase 4 records on ebay for anywhere from $1. to $25. My personal favorite recording for sound dynamics and great horns/woodwinds is the Si Zentner 1965 rendition of "Fly Me to the Moon" which was included in an RCA Dynagroove demonstration album titled "Sounds Fantastic" that was released in 1965 to RCA dealers to promote their line of home stereo units. The records were designed with showroom-auditions of stereo consoles(floor-models) in mind. The record is very impressive. Available on ebay for around $1-$10, depending on condition. I would like to add that many non-Dynagroove records were released by RCA during the same time period, most notably, and in the largest numbers, those by Elvis Presley. The sound quality on those LP's is very good, and even excellent...clean, full-range, and dimensional(good L-R channel separation), but definitely not having the enhanced dynamics of the Dynagroove records. A great topic for serious vinyl audiophiles.

Posted by Steve L. October 22, 2014 - 08:28 am
Hi Robert, I appreciate the fascinating comparison of playing Dynagroove with conical and elliptical styli. It is interesting that you found the conical playback to be cleaner. Ordinarily, one would expect the elliptical to be cleaner (with ordinary records). Of course, this doesn't answer the question of whether Dynagroove played with an elliptical stylus is better or worse than an ordinary recording played with elliptical. Nevertheless, it is a useful part of the puzzle.

May I ask, would it be at all possible for you to record MP3 files of a sample from the inner grooves, played with the two different styli? I would love to post them with the article, for comparison. If you are able to, you can reach me at [see homepage ABOUT]. Thank you for the great posting.

Posted by Robert from NJ October 16, 2012 - 06:07 pm
I have a collection of RCA Victor Dynagroove recordings that I play on a fairly high-end, albeit vintage, 1970's system. I was never aware of the Dynagroove records as being optimized for use with a .7 mil conical stylus until I researched the topic on the web several years ago. I purchased an additional headshell and installed an Audio-Technica .7 mil round stylus cartridge for exclusive use with my Dynagroove albums. I can honestly say that there is a cleaner sound using this setup as compared to using my Shure M110E setup. Aside from the technical aspects of the Dynagroove process, the musical content, arrangements, and artists were of very high caliber, in my opinion. The sound of these records when played back on a decent system stands up very well in this age of digital audio. I would also feel negligent if I didn't mention the very fine audiophile recordings released on the Command label from 1959 to approx. 1966(before Enoch Light founded Project 3 Records). The sound of these records can be very impressive if one has well cared-for copies. The dynamics and dimensional effects are in my opinion, breathtaking. Just the humble opinion of a vinyl-lover.

Posted by Steve L. May 19, 2012 - 07:26 am
Hi Steve W, Thank you for your comments. It's interesting that you mention Al Hirt. I used to love to listen to my older brother's Al Hirt albums back in the sixties but haven't thought about those in some 40-years or so! I will have to check out some old recordings.

Posted by Steve W. May 18, 2012 - 11:37 pm
Steve -- informative article on Dynagroove. Thanks. I Googled the term while digitizing an old Dynagoove recording of trumpeter Al Hirt (Sugar Lips) that I recently bought at a thrift store. I had a mono version of the album as a teenager, and even then to my untrained ear and on fairly good (conical?) playback equipment of the '60s, I could hear something a little odd in some passages. Listening now, I consider it a bright recording, though not out of line with the genre. Interestingly, the trumpet is rich in high frequency content, particularly so in the triple forte of Hirt's high notes. In some passages, this results in a slightly objectionable quality to the instrument. All that said, the overall presentation of the tracks seems less obnoxious than many current CD productions.

Posted by Steve L. May 19, 2012 - 07:32 am
Hi Flavio, Thank you for your kind comments. Yes, I think Dynagroove has been unfairly treated in some circles. I hope for a more balanced view of the technology. Steve


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