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06-15-2023, 01:10 PM
Hi Guys
Note that all the resistors in our kits are 1% tolerance (E96 values), which means they have three number bands, then the multiplier, then tolerance band. It is easy to confuse the values if you are only used to 5% resistors (E24).
Also note that for the 800 wiring there is a cap position left open (C3,5). Adding a cap here greatly increases the gain from the stock 800 level. The schematic has a note to this effect.
Regarding the EQ: No effect suggests the ground is missing.
With the tubes in place and Volume and Gain at zero, measure the plate voltages for each tube. This is pin-1 and 6 of each tube. These voltages should be 50-100V lower than the voltage at the related supply node.
Since you are getting sound, it is likely that the heaters are wired correctly: Twisted wire pair to 12V wire block; NO LINK in 6V block. And actually getting 12V from the PSU.
Note that when soldering any double-sided PCB, there should be solder wetting around component leads on both the top and bottom. Ideally the plated hole provides conduction between top and bottom traces but this should not be counted on.
Note that all the resistors in our kits are 1% tolerance (E96 values), which means they have three number bands, then the multiplier, then tolerance band. It is easy to confuse the values if you are only used to 5% resistors (E24).
Also note that for the 800 wiring there is a cap position left open (C3,5). Adding a cap here greatly increases the gain from the stock 800 level. The schematic has a note to this effect.
Regarding the EQ: No effect suggests the ground is missing.
With the tubes in place and Volume and Gain at zero, measure the plate voltages for each tube. This is pin-1 and 6 of each tube. These voltages should be 50-100V lower than the voltage at the related supply node.
Since you are getting sound, it is likely that the heaters are wired correctly: Twisted wire pair to 12V wire block; NO LINK in 6V block. And actually getting 12V from the PSU.
Note that when soldering any double-sided PCB, there should be solder wetting around component leads on both the top and bottom. Ideally the plated hole provides conduction between top and bottom traces but this should not be counted on.
