Cambridge CD1 2 box player...where's the dacs? pics - diyAudio
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Old 29th June 2006, 12:53 AM   #1
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Default Cambridge CD1 2 box player...where's the dacs? pics

Just picked up a vintage Cambridge CD1(i) 2 box player that has me scratching my head. I looked inside to see what DACs were used(the little info I found says 1541(a)). Thought maybe the older 1540's might even be used. This unit seems to be hand assembled , with most of the electro caps bypassed with wima's and even the voltage regs have them mounted directly to the pin outs. I remove the shielding over the main board , only to find the place were the DACs should be(?) are empty. I see reciever chips(saa72xx)and such , but nothing familair to me that Philips made in that era(early 80's).I also count 3 clocks. The data appears to go out of the main unit via embillical cord(one for data , one for power) to the top box. This contains 2 boards that make up the 'conversion filters' and ,I suppose , the output stage. 7 small relays switch on/off when one or all of the filter selectors are lit. Perhaps I am missing something: I included some pics and will be greatful for any info
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Old 29th June 2006, 12:54 AM   #2
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Default cd1 pics

cd1
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Old 29th June 2006, 12:55 AM   #3
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cd1
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Old 29th June 2006, 12:58 AM   #4
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Old 29th June 2006, 01:00 AM   #5
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Old 29th June 2006, 01:05 AM   #6
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oh , Stereophile , issue 10-3 , had a write-up on this unit , but nether me ,nor Stereophile has this issue. If someone has this one , please let me know. And tell me if more pics are needed
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Old 29th June 2006, 02:25 AM   #7
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The board in post #2 is missing a pair of TDA1540's , though whether by accident or design, I couldn't tell you. Could the dacs be elsewhere in the top box ? Do your pictures include the conversion filters and output stage ?
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Old 29th June 2006, 02:40 AM   #8
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The second and thrid posts are of the digital circuit boards that are under the shielding , ,and that is pretty much it. There is another small board mounted vertically on the front panel , but no DAC chips ,at least known to me. I'll post that pic here.
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Old 29th June 2006, 02:44 AM   #9
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This is a picture of the top box. 2 identical boards that have intrgrated components I've never seen before(no markings)
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Old 29th June 2006, 02:49 AM   #10
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BTW , this unit works fine and sounds excellent. The 'comversion filter" switches also work and seem to make some change in sonics. A very unusual cd player design.
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