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05-25-2023, 01:23 PM
Hi Guys
Answers to Qs in post-8:
1 - No need to heat sink the bridge rectifiers. When we assemble these kits we leave the leads full length to provide heat sinking. Push the leads of the bridge most of the way through, then splay the outer leads outward, then push the bridge back up until about 1/16" or 1-2mm is still protruding. Make sure the bridge is square to the board and solder the leads.
Do the same with QN1-4 for the 12W version of PSU-PRE.
2 - If R10-13 are missing that is simply a kit packing error. We will send you the parts if you send us an email to our normal address. A value range is listed simply to accommodate availability.
3 - No contradiction. The above guide was indicating the AC voltages from T1 (plate) and T2 (heater) assuming there is power limiting via a low-wattage lamp in the PLSS.
For 12Vdc output: Install link-7 only
For 6Vdc: install links 4,5,6
Links 4,5,7 connect the two secondaries of T2 in series or parallel; link-6 shorts out one of the zeners as needed for 6V.
Link-8 is to connect the positive end of the heater DC output to the ground for the high-voltage section (circuit ground). With link-8 open, you have the option to tie the DC output to a DC-stand-off for double hum rejection, or to tie the negative output to circuit ground for a +6/+12 output. The default is to have a negative rail for the heater supply to accommodate powering ERK for channel switching, as the notes state.
Have fun
Answers to Qs in post-8:
1 - No need to heat sink the bridge rectifiers. When we assemble these kits we leave the leads full length to provide heat sinking. Push the leads of the bridge most of the way through, then splay the outer leads outward, then push the bridge back up until about 1/16" or 1-2mm is still protruding. Make sure the bridge is square to the board and solder the leads.
Do the same with QN1-4 for the 12W version of PSU-PRE.
2 - If R10-13 are missing that is simply a kit packing error. We will send you the parts if you send us an email to our normal address. A value range is listed simply to accommodate availability.
3 - No contradiction. The above guide was indicating the AC voltages from T1 (plate) and T2 (heater) assuming there is power limiting via a low-wattage lamp in the PLSS.
For 12Vdc output: Install link-7 only
For 6Vdc: install links 4,5,6
Links 4,5,7 connect the two secondaries of T2 in series or parallel; link-6 shorts out one of the zeners as needed for 6V.
Link-8 is to connect the positive end of the heater DC output to the ground for the high-voltage section (circuit ground). With link-8 open, you have the option to tie the DC output to a DC-stand-off for double hum rejection, or to tie the negative output to circuit ground for a +6/+12 output. The default is to have a negative rail for the heater supply to accommodate powering ERK for channel switching, as the notes state.
Have fun
