Just a note. Looks like you had RX, RF gain maxed out and that's ok on the higher bands, however on 160 - 40 meters back the RF gain down a bit and the RX will not overload as much. Yes the AGC is suppose to throttle the gain but on many rigs of that era it's not as effective. Good luck es 73
The plate current will be low for two reasons, 1 improper alignnment, it can NOT be final- aligned in RX. It must be redone in TX to get proper drive. 2. Drake improperly designed the V4 stage, it destroys the TX mixer 6HS6, see my video on the TR4 mixer failure. The Xmit Gain is much too high 8n the 20m test, it should be about 09:45, showing lack of drive.. Since the VFO does not mix with the L.O in 80m, the low VFO output causes inability to load on 80.
Drift in vapacitor values in the mixer and PA driver causrle a skew in alignment between RX and TX. The alignment load is required to reduce the 2nd harmonic and level the VFO output else the TX power will be low at the bottom of the band. At 350 - 400 mA, its badly misaligned, and cannot be neutralized due to improper drive. Theres no such thing as matched tubes in parallel, thats a myth. I did a video explaining why.
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Great finish to your video series.
Been looking for info on the TR-3. Want to add one to my pile. Nice work and thanks, Carl AB1ZI 73
I just lay a fan on top of the case over the finals on my TR4… pulling air up and out of the case…. Air comes from the bottom… 73
Nice work! I still have a full C-line (R-4C, T-4XC, MS-4 with AC-4, MN-4 and L-4B). 73 de OH7WV
Just a note. Looks like you had RX, RF gain maxed out and that's ok on the higher bands, however on 160 - 40 meters back the RF gain down a bit and the RX will not overload as much. Yes the AGC is suppose to throttle the gain but on many rigs of that era it's not as effective. Good luck es 73
Thanks Darryn grate job on the TR-3 I will need to do the same to mine which I have owned for decades. Do you sell those relay boards? thanks wb7qxu
Instead of a fan, hack on an EasyBake Oven, to use the heat. Ooo, cupcakes...
The plate current will be low for two reasons, 1 improper alignnment, it can NOT be final- aligned in RX. It must be redone in TX to get proper drive. 2. Drake improperly designed the V4 stage, it destroys the TX mixer 6HS6, see my video on the TR4 mixer failure.
The Xmit Gain is much too high 8n the 20m test, it should be about 09:45, showing lack of drive.. Since the VFO does not mix with the L.O in 80m, the low VFO output causes inability to load on 80.
Drift in vapacitor values in the mixer and PA driver causrle a skew in alignment between RX and TX.
The alignment load is required to reduce the 2nd harmonic and level the VFO output else the TX power will be low at the bottom of the band.
At 350 - 400 mA, its badly misaligned, and cannot be neutralized due to improper drive.
Theres no such thing as matched tubes in parallel, thats a myth. I did a video explaining why.
❤is that a new oscilloscope in the background?