From: "stephane.mazzoni" 
Subject: [drakelist] DRAKE R-4C restoration - S-meter may be not deflecting
sufficiently

original=20
position.4. What has been measured :The plate
voltages =
measured are=20
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 4-8=20
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 circuit=20
(Q7 2N3877) whereas this circuit is marked as supplied with -100V=20
(?!)Practically, I observe -69V supplied to this circuit. All 1N4148 =
diodes=20
(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.

------=_NextPart_000_006D_01C4C238.5137B920--


----------------------------------------------------------------------
On Behalf of "stephane.mazzoni" 
Submissions:        drakelist{at}www.zerobeat.net
Unsubscribe:        majordomo{at}www.zerobeat.net - unsubscribe drakelist in body
Hopelessly Lost:    majordomo{at}www.zerobeat.net - help in body of message
Zerobeat Web Page:  http://www.zerobeat.net
Brought to you courtesy of TLCHost.net  http://www.tlchost.net/
----------------------------------------------------------------------

---