Difference(s)between Roberts R300 and later R200?

[Old Sparky]

I'm in the process of repairing a Roberts R300 (replacing the AF117s with 3 x GF322A) and wondered what the difference between this model and the 3rd version of the R200 was, as I don't see any obvious differences, checking this set against the R200 circuit diagram. If anyone knows of any differences, I'd be interested to know what they are.  BTW the pin-outs of the GF322A makes for easy fitting in the R300, as the original AF117s are fitted in such a way that only the screen & collector leads of the GF322 need crossing over.  They can then be inserted in the PCB with relative ease.  I fitted sleeving on the base & collector leads of the replacement transistors to ensure that, in particular, the screen & collector leads of the GF 322As couldn't touch each other.

[Old Sparky]

Since posting the above I've downloaded the service sheet for the R300 from UKVRRR, and this confirms that the 300 is virtually identical to the 3rd (AF117)version of the R200

[Old Sparky]

Having now worked on the R300, replacing the three AF117s with GT322As's, there are only minor differences between it and the R200 (3rd version), one being that the R300 has a 330 ohm resistor in series with the detector diode and volume control, whereas the R200, at least according to it's circuit diagram does not. Otherwise they're identical.