What you need depends on what you intend to align. I am considering three-terminal regulators for the power supply - the current limit is set for 150 mA, so you don't need much and two electrolytics would disappear, including C4. One worth noting is that the silkscreen for C4 on the power supply board shows the wrong polarity - the capacitor is in the right way around but the board markings are wrong. Not bad for a meter I got for $10, but you have to be aware of the design errors. BTW I replaced R365 again with a 390 ohm 2-watt resistor. Getting this thing apart and putting it back together is like building a ship in a bottle, so I wanted to fix it once, get it right and have it work for the rest of my life.
If you don't have the manual, it is free online at: I am not sure if the MPF 102 that I have is bad or simply at the high end of the pinchoff voltage. I recapped the electrolytics in the power supply and RF board at the moment and I am upping the voltage rating on all the electrolytics. In general, I use a derating of 60% for electrolytics where possible and any spike or circuit anomaly that will drive the voltage above 15 would kill the supply. The power supply output capacitors run at 12 volts and are rated at 15 volts.
Sencore apparently has no concept of derating or even doing the design properly. I have replaced it with a 390 ohm 1 watt and even that may be marginal. The board was getting scorched under this resistor so I took it out and measured it - 2195 ohms.
R365 is a 390 ohm 1/2 watt resistor that will work if the TR316 FET, which is an MPF 102, has a low pinchoff voltage but not for one with a high voltage (but still within spec). The output of the output buffer? All wrong. Into the isolation and output buffer - still OK. I checked the audio oscillator - excellent 400 Hz waveform there.
The design does not use adequate margins and in some cases will have negative margin. I get half the square wave and none of the RF signals. I went through a rebuild of my SG165 because I could get the positive half of the 400 Hz waveform but not the negative. The SG165 is OK for older tube tuners with limited harmonic distortion specs but for high-end tuners, you need something more modern like an HP 8640B or a Signal technologies ST1000A. Click to expand.The maximum frequency for the one you have quoted is 20 MHz, so forget about using it for RF alignment.