New Member with questions

gene french

Veteran and General Yakker
Joined
Mar 6, 2022
Messages
5,555
Location
guayabo de bagaces, guanacaste, costa rica....
Tagline
music...the healer of souls...
#25
Thank you Gene. googling a dim bulb tester now. I guess it's not like rebuilding a Heathkit SB-220. 73, KJ4LAA
go to hifiengine.com....download free pl400 service manual...they list suitable replacements in troubleshooting....they do say to "match" outputs...ie. use same transistors in each channel.....as watts would tell you...read and reread the service manual...
 

KJ4LAA

New Around These Parts
Joined
Sep 8, 2023
Messages
6
#28
hw 16 ...my favorite ...
hw 101...
sb 220...
accukeyer...
etc...
lol
I built my first HW-101 in 1982-3 when I was KA3KOE. I rescued several SB-220, SB-200, SB-230 and HA-14's that I want to restore. One of these days I'll get to them. Yesterday I saw something shiny and cheap (PL400-Squirrel!!) and jumped on it. I'm heading to Lowes and get the parts for a Dim Bulb Tester. The 100 watt lightbulb might be a challenging find.
 

gene french

Veteran and General Yakker
Joined
Mar 6, 2022
Messages
5,555
Location
guayabo de bagaces, guanacaste, costa rica....
Tagline
music...the healer of souls...
#29
I built my first HW-101 in 1982-3 when I was KA3KOE. I rescued several SB-220, SB-200, SB-230 and HA-14's that I want to restore. One of these days I'll get to them. Yesterday I saw something shiny and cheap (PL400-Squirrel!!) and jumped on it. I'm heading to Lowes and get the parts for a Dim Bulb Tester. The 100 watt lightbulb might be a challenging find.
ham radio has really changed...as everything else...i miss the diy days...working on vintage gear helps ease the pain...lol
 

gene french

Veteran and General Yakker
Joined
Mar 6, 2022
Messages
5,555
Location
guayabo de bagaces, guanacaste, costa rica....
Tagline
music...the healer of souls...
#33

KJ4LAA

New Around These Parts
Joined
Sep 8, 2023
Messages
6
#34
Some of us can get by with using the Variac. Some can't. You just have to be smarter than the knob.
Ran to Lowes and got all the goodies and built my Dim Bulb Tester. I may incorporate this with my isolation transformer and a variac as well. I have some 100W incandescent light bulbs on order, although I did test it with a 3-way bulb (50w-200w-250w) and it appears to be working. If you have ever watched Mr. Carlson's Lab on YouTube, he has a nice current limiting variac setup hung on his wall. Thank you so much for the tip.
 

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KJ4LAA

New Around These Parts
Joined
Sep 8, 2023
Messages
6
#35
go to hifiengine.com....download free pl400 service manual...they list suitable replacements in troubleshooting....they do say to "match" outputs...ie. use same transistors in each channel.....as watts would tell you...read and reread the service manual...
Unfortunately, they are no longer accepting new accounts so downloading is a no-go.
 
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