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Old 21st January 2007, 02:38 PM   #1
jkeny is offline jkeny  Ireland
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Location: Dublin
Default Rogers Cadet III schematics Corrections

For all Rogers Cadet users - just gathering together & correcting schematics & info I have gleaned from posts & my circuit tracing. There is one mistake on the schematic posted here & attached below but I don't know how to redraw. Maybe EC8010 or Planet10 have the original?

The schematic error is that 6p8 cap (feedback?) from plate of bottom output tube should go directly to grid of top output tube (two halves of same tube so cap goes accross pin 6 & 8) - does not connect before 100nf cap.

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File Type: gif rogers-cadet-iii schematic resized.gif (31.8 KB, 183 views)
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Old 21st January 2007, 02:45 PM   #2
jkeny is offline jkeny  Ireland
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Another correction is to the PU adaptor which controls the RIAA equalisation
Gold coloured disc PU adaptor

Its its wired symmetrically , pins 1 to 4 away from the earth (0).

resistor : blue - grey- orange - gold : pins 1 and 3. (68K 5%)
resistor : voilet - red - yellow - gold : pins 2 and 3. (720K 5%)
capacitor : polystyrene - 680P - 5% - 350V : pins 2 and 3.
capacitor : polystyrene - 2500 - 5 - 400V : pins 2 and 4.

I assume the 1st capacitor is 680pF.

I think (and the size agrees) for the second capacitor the last
digit is a power of 10 multiplier for PF = x1 = 250pF.
The 5 I assume is 5%.

This is correct except for 720K should read 120K

Thanks to all those who have put in the hard work to sorting out these schematics - it makes the rejuvenation of this tube amp possible & helps the recycling movement.

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Old 21st January 2007, 04:13 PM   #3
jkeny is offline jkeny  Ireland
Join Date: Feb 2007
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I'm sorry - my first post is mistaken - the first schematic is correct - I double checked it.

Second post is correct - RIAA res value is 120K not 720K

Apologies to all concerned

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Old 21st January 2007, 08:04 PM   #4
EC8010 is offline EC8010  United Kingdom
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You had me worried for a moment there...
The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...
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Old 21st January 2007, 08:23 PM   #5
jkeny is offline jkeny  Ireland
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Ye - sorry EC8010
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