Rogers Cadet III schematics Corrections

[jkeny]

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.

John

 

[jkeny]

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%.

sreten.

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.

John

 

[jkeny]

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

John

 

[EC8010]

You had me worried for a moment there...

 

[jkeny]

Ye - sorry EC8010