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Internal adjustments: varying the input capacitance

Making the internal adjustments

Nº28, internal adjustments

If you wish to vary the input capacitance of the phono option to obtain the optimal value for a particular cartridge, a capacitor may also be inserted into the optional load terminals (see "Terminating the optional load" and "Making the internal adjustments").

Because the inherent input capacitance (all switches off) is in parallel with the optional load terminals, use the following formula to calculate the actual capacitor needed.

C = CR - CT - CP

C = The capacitor value

CR = Recommended capacitance value CT = Tonearm capacitance including leads CP = Preamplifier inherent shunt capacitance

(Low-gain phono option = 100pf; high-gain phono option = 1000pf)

Note: We recommend high-quality polypropylene, polystyrene or Teflon capacitors; see your Mark Levinson dealer.

1.Make sure all associated equipment is disconnected from the AC mains, and that the PLS-228 is disconnected from the AC mains.

2.Using a 5/64" Allen key, remove the eight 6-32 flat-head socket- cap screws securing the Nº28's top cover. Carefully lift the top cover and remove it.

1 2 3 4

Cartridge loading
(right channel)	Phono gain
	Phono gain
	(right channel)
	O	1	2
Optional load pins	N
Optional load pins
	O
	F
	F
Cartridge loading
(left channel)	Phono gain
	Phono gain
Optional load pins	(left channel)
	Line gain

3.Adjust the gain switches (using a ballpoint pen or similar instrument) and install optional loads as desired.

4.Reassemble the Nº28.