Gemini III dual fuzz dissected

[chuckd666]

I have a couple MP20Bs for Q1 and Q2, and a Sanyo 2SD187 for the NPN Germ. The Hfe for the NPN is a little lower than I assume it should be. It was around 60-70 I believe.

[digi2t]

Yeah, if you use what I prescribed on the vero for Q3 gain (100 - 115 hfe), that should bring your voltages into line. You should be able to get pretty close to the original voltages all around.

[chuckd666]

Yeah I figured that must be the culprit. It sounds good at the moment, but might just have to get a bunch of NPNs somehow. Thanks again for the help. A/B'd with my real one it sounds pretty on par.

[Zoot]

Hello all,
I'm having some slight voltage issues with my Fuzzimile (spaceman gemini iii) build, and I can't seem to find the cause, yet.
Am using the prescribed Russian transistors all within the defined specs. Checked resistors and caps twice.
Everything works, I'm just trying to get to the right biasing point. I can't manage to get Q3/Q6 right, there are much less variation between EBC in my readings, and trimmers can't help. Q5 collector behavior also seems odd.

Voltages are as following (reference voltages from Digi2T in brackets)

Supply: 9.31V (9.05)

Q1
MP20V - Hfe: 84; Iceo:82uA
E: 2.332 (2.044)
B: 2.200 (1.916)
C: 1.440 (1.452)

Q3
GT402V - Hfe:128; Iceo: 95uA
E: 1.720 (1.336)
B: 1.665 (1.174)
C: 1.652 (0.805)

Q6
GT404V - Hfe: 103; Iceo: 270uA
E: 1.720 (1.336)
B: 1.766 (1.416)
C: 1.779 (1.702)

Q4
2N2222A
E: 1.731 (1.238)
B: 2.205 (1.914)
C: 2.286 (3.246)

Q5
2N2222
E: 1.585 (1.726)
B: 2.186 (2.209)
C: 1.775 (2.358)

Q6
2N3700
E: 1.183 (1.136)
B: 1.759 (1.726)
C: 2.291 (2.358)

Q7
2N5088
E: 0.159 (0.159)
B: 0.707 (0.709)
C: 1.669 (1.507)

Any light that can be cast on these voltage variations is appreciated.
Picture shows the transistor in the build.
Thanks,
Zoot