HELP! Advice needed on phonostages with DECCA RIAA

[daytona600]

DECCA geek Andrew do you mean Decca cartridges or Decca FFRR curves

RIAA - used phonostages with all the Decca & all major RIAA curves & more like a subtle tone control
& they might be a myth anyway

http://www.analogplanet.com/content/...TSkJZqKATl9.97

Cartridges
used them for decades & work with most phono stages , but excel with great ones

Fully passive RIAA & DECCA equalisation
• Unique continously variable input impedance loading,
matches every cartridge (adjustment even while playing)

http://www.project-audio.com/main.php?prod=phonoboxrs

[Barry]

Andy, sounds like you are confusing record playback equalisation with input impedance of the phono input (that is the electrical loading of the cartridge).

Deccas are quite happy with the now long standard input impedance of 47kOhm (in fact Decca quote 50kOhm). However there are some who find that an increased loading of 33kOhm is preferable. To some extent it depends on the system; in mine 47k is fine, in my friend's we found 33k to be better. We experimented with even higher loading (reducing the input impedance in stages down to 24kOhm). There was no improvement, only increasingly impared tracking due, I assume, to the increased electrodynamic loading and hence damping of the cartridge.

To make matters worse there are some enthusiasts (notably in the US) who suggest the loading should be reduced by running the cartridge into loads as high as 1MOhm. I haven't tried this as I find 47k is fine, and see no reason to increase the impedance (which practically is not so easy to do).

There is also no real need to fiddle about with capacitance values. Changes in this area seem to have less of an effect with Deccas than they do with other fixed-coil cartridges.

As other have commented, Glenn Croft is a Decca user, so his preamps will presumably be set up to allow the Decca cartridge to operate in an optimum electrical environment.

[Arkless Electronics]

What about the BBC equalisation curve? Can you do that as well?

Why of course and NAB

[Barry]

http://midimagic.sgc-hosting.com/mixcurve.htm

Although the RIAA curve was proposed in 1954, it was not universally adopted and it took several years before the various record companies all complied.

However unless you have some recordings which were made before 1964, I wouldn't worry.

[Arkless Electronics]

Abit more QI stuff on it... IIRC Decca FFRR EQ was first used by Decca (78RPM) in response to a war dept need for extra high fidelity reproduction of something or other to fool the Nazi's.... or I could have dreamt that

[struth]

Think they used wire recordings during the war for their imaginary armies etc. Miles of it.

[daytona600]

Abit more QI stuff on it... IIRC Decca FFRR EQ was first used by Decca (78RPM) in response to a war dept need for extra high fidelity reproduction of something or other to fool the Nazi's.... or I could have dreamt that

No dream Jez
The original Decca company was started in the 19th century, but it's first involvement with music was with a portable record player used in the trenches during the 1914-18 world war. In the 1939-45 war the government asked Decca to produce a system to identify British submarines from German ones, which resulted in the ffrr (full frequency range recording) system. In 1944 Decca produced the first ffrr music discs. The first LP record (mono) came in 1951 followed by stereo in 1958. Engineers Bayliff and Cowie then designed the Decca ffss (full frequency stereo sound) tonearm and playback head which had Mk I, II and ill versions

[topoxforddoc]

Now that I'm well on my way to becoming a DECCA geek I got round to thinking if it might be a good idea to get a phonostage specifically built for DECCA RIAA or purchase one with the option already built in. So far I've seen the latest audio research reference pre-amp costing mucho dosh and the latest phonostage from ifi audio. Any other suggestions?

Andrew,

I asked Graham Tricker to build me a TRON Seven Reference to suit my Decca FFSS MkIV C4E. It sounds stunning. However, that's mucho dosho! I listened to his new baby TRON Convergence phono about 18 months ago, and it had 90% of the SQ for £900 (MM), as opposed to nearly £5k. I'm sure that he could build you a Convergence to suit the Decca. If you were closer, I would suggest you come and have a listen.

Charlie

[Arkless Electronics]

There is nothing special or unusual about Decca cartridges that requires a non standard phono stage... one cannot build a phono stage "to suit" Deccas

My remarks in my first post were to do with Decca eq to suit records made by Decca at one time, not to suit the cartridge.

[YNWaN]

Yeah, I think the Decca (as in the record label) recording curve is being confused with the Decca cartridge.


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