Well parts have been ordered and are trickling in. I have a station set aside in the comp room so the wait is on.
Choices:
Edcor Transformers and Choke. 740VAC sec For Tube Power and 50000 ohm Z; 8 ohm Output.
Tube/SS Rectifier switch (yes)
Hammond Chassis (Black & Walnut) ( 10" x17" working space topside.
with the exception of Volume Knob and Power switch, all user controls on top. outboard of tube area
Planned additions and/or mods.
VU Meters ( Front Panel flanking central Volume Knob.
10-pos selector switch for selecting Cathode resistors. allowing max tube selection .( need 9 pos.'s but those are harder to find than bigfoot)
A separate max set pot feeding each deck of the volume pot to set max Volume for Main volume Knob full CW for each channel.
I'm Going to try to eliminate the diode eating spike from the Standby switch Op with an RC snubber and if successful, its back in.
Choices:
Edcor Transformers and Choke. 740VAC sec For Tube Power and 50000 ohm Z; 8 ohm Output.
Tube/SS Rectifier switch (yes)
Hammond Chassis (Black & Walnut) ( 10" x17" working space topside.
with the exception of Volume Knob and Power switch, all user controls on top. outboard of tube area
Planned additions and/or mods.
VU Meters ( Front Panel flanking central Volume Knob.
10-pos selector switch for selecting Cathode resistors. allowing max tube selection .( need 9 pos.'s but those are harder to find than bigfoot)
A separate max set pot feeding each deck of the volume pot to set max Volume for Main volume Knob full CW for each channel.
I'm Going to try to eliminate the diode eating spike from the Standby switch Op with an RC snubber and if successful, its back in.
kijiji - got a used greenlee knockout punch cheap from an electrician who'd just retired. I just looked locally and there are lots available.
Yeah. but The ones electricians use are usually sized for conduit. Thanks, but I'll stick with the step bit.
This is what I'll use.https://www.amazon.com/dp/B07C2W9X4...olid=2USCC1PBSE0K9&psc=1&ref_=gv_ov_lig_pi_dp
I got mine at Harbor Freight. Way too spendy for my uses elsewhere. Not sure if it was metric or not, all I know is it was big enough for an octal socket. Came out way cleaner than my first chassis with a step bit. I used the same 17” chassis on the first go and slimmed it down to 14” for my ‘redo’. The footprint was too big and half the chassis was empty lol
I bought some 12 way rotary switches, and they had a collet under the fixing screw that could be moved to limit the selection. Maybe yours are similarly adaptable.
52 mm is nearly 2". 25.4 mm per inch. Unless you can find a used example, a 2" Greenlee-type panel punch will be prohibitively expensive (ca $150). I would use a hole saw in my drill press. An import 2" hole saw can be bought for under $10 online.
https://www.amazon.com/Koopi-BI-METAL-Replacement-Drilling-Plastic/dp/B07TMP8J62/ref=sxin_15_ac_d_bv
Drilling with a hole saw by hand can be tricky and may not make a very clean hole. I bought this small Wen for my home https://www.amazon.com/gp/product/B08ZVT5JKC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 and have a Jet floor-stander I can use at work. The little Wen is great for light electronics work. With a drill press, you can use a fly cutter https://www.amazon.com/General-Tools-55-Cutter-Adjustable/dp/B00004T7P1/ref=sr_1_5 but do not try to use one of these in a portable drill. In any case, clamp your work securely before cutting any large holes.
https://www.amazon.com/Koopi-BI-METAL-Replacement-Drilling-Plastic/dp/B07TMP8J62/ref=sxin_15_ac_d_bv
Drilling with a hole saw by hand can be tricky and may not make a very clean hole. I bought this small Wen for my home https://www.amazon.com/gp/product/B08ZVT5JKC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 and have a Jet floor-stander I can use at work. The little Wen is great for light electronics work. With a drill press, you can use a fly cutter https://www.amazon.com/General-Tools-55-Cutter-Adjustable/dp/B00004T7P1/ref=sr_1_5 but do not try to use one of these in a portable drill. In any case, clamp your work securely before cutting any large holes.
Are you cutting it in aluminium? You can try drilingvholesxaroud the inside an reving by cutting between them with a hacksaw. The get so aggressive sandpaper, or a rasp to get rid of the bulk waste. And finish with a conical tube - can be a household item like a ketchup bottle. Wrap the sand paper tight and rotate in the hole by handuntil the hole is enlarged enough.
Yeah I know no updates for .. forever.. I have issues. A stroke in '19 left me a little muddy brained and can't totally trust my vision (Long explanation).
I'll need to be extra carful during check out.
Anyway I'm getting closer. I've added test point jacks for the main elements on the OT tubes as wel as B+, accessible from the rear of the chassis. I'm very close to final assembly and check out. Original tube set is 6L6GC with JJ EL-34 andJJ KT88 waiting in a shopping kart @ Antique electrical once tne checkout is complete. Considering the effects of the stroke make this is a challenge but I'm determined to complete it. I just need to be meticulous and careful during checkout for safety.
I'll need to be extra carful during check out.
Anyway I'm getting closer. I've added test point jacks for the main elements on the OT tubes as wel as B+, accessible from the rear of the chassis. I'm very close to final assembly and check out. Original tube set is 6L6GC with JJ EL-34 andJJ KT88 waiting in a shopping kart @ Antique electrical once tne checkout is complete. Considering the effects of the stroke make this is a challenge but I'm determined to complete it. I just need to be meticulous and careful during checkout for safety.