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Re: CD4 Demodulator

Peter — Tue, 01 Jun 2010 10:48:26 GMT

They will be fine in stereo - it is the rear channels that suffer. The CD4 record essentially encodes the rear channels at a much higher frequency and this is then decoded later. A heavy cartridge simply flattens these very high frequencies. The big advantage for the rest of us is that lots of work was done to reduce this effect and make the vinyl better. Most so called audiophile stereo recording owe their quality to CD4 record technology! I have a number of quad records - some are good and some are awful!

Re: CD4 Demodulator

Berniequad — Tue, 01 Jun 2010 05:49:20 GMT

Thanks for your reply Peter bit supprised by your experience on CD4 record wear?

It just so happened I recently purchased quad records on ebay as I buy most of my

present collection thought they were SQ but found they were CD4 format seem to

be in good condition.

Bernard

Re: CD4 Demodulator

Peter — Wed, 26 May 2010 08:49:46 GMT

Very rare - I have had one but it went to Bellac and was lost.

The problem with CD4 records is that they wear dreadfully - if someone has played them with a big heavy arm and cartridge combination, they are wrecked. They do sound better than SQ in my view but not for long! I actually took the CD4 decoder out of my 6000 as a friend wanted it and I had stopped using quad records.

CD4 Demodulator

Berniequad — Wed, 26 May 2010 06:20:54 GMT

I am looking for a CD4 Demodulator unit (small printed board) to fit/convert my BeoGram 3400

so I can play Quad CD4 records, at moment only can play SQ format recordings.

Can anyone help? B&O made two types of units 1974 to 1979 as accessories to fit Beogram 4000 and 3400.

Alternatively anyone wanting to sell a Beogram 6000 where the modulator was fitted as standard.

Thanks for any help. Berniequad