From: "Rocco Lardiere" 
Subject: Re: [drakelist] DRAKE R-4C restoration - S-meter may be not
deflecting sufficiently

to its=20
  original position.4. What has been measured
:The plate =
voltages=20
  measured are all OK with respect to the Instruction Manual, page 5-4, =
Voltage=20
  Chart.According to Instruction Manual, page 5-4, Table 5-2, =
voltage chart,=20
  the AGC input on grid 1, should be within -1 to -1,5V.Practically, =
this is=20
  actually observed.According to Instruction Manual, page 4-2, =
section=20
  4-8 S-meter, the AGC line should swing to -40 V when the when the mute =
line is=20
  isolated from the MUTE line.Practically, I observe that the grid 1 =
of V3=20
  swings to -13 V and, the =3Dgrid 1 of V4 swings to -22 =
V.
  According to Instruction Manual, page 5-9, figure 5-3, schematic =
diagram,=20
  the power supply should generate -70V for the operation of the =
=3DAGC=20
  circuit (Q7 2N3877) whereas this circuit is marked as supplied with =
-100V=20
  (?!)Practically, I observe -69V supplied to this circuit. All =
1N4148=20
  diodes (CR1, CR12 and CR13) of this circuit have been checked and =
found=20
  OK.According to Instruction Manual, page 5-9, figure 5-3, =
schematic=20
  diagram, the power supply should generate +150V for the plates.The =
plate=20
  voltages should be according to Instruction Manual, page 5-4, column=20
  5.Practically, I observe that the voltages checked are=20
OK.

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