Hoping to stimulate some discussion on Old Ham Tube Linear Amps:
? Are there any experienced with the various Tube Amp issues,
???? ... such as Arcing and Band SW,? coil,? capacitor & tube and HV Xfrmr destruction in these amplifiers ?
I am beginning to refurbish two old Heathkit Linear Amps:
?? the SB-1000? ( similar to the AL-80)?
& the SB-200.
? Scouring the Web looking for information on refurbishing issues and modifying old Heathkit Ham Linear Tube amplifiers
quick summary:
PS Cap board
Metering board /Bias
Soft-Key
Soft-Start
Parasitic's
Glitch resistor
HEC HV Caps
Self-biasing of relays
"Corona Washer "
QSK
new tubes ...
poor solder joints (expected)
Band Sw issues,
etc.
There are plenty of Ham Blogs on the SB-200? & SB-220,? ...? but fewer on the SB-1000 & HL-2200.
?Articles by Richard Measures, and others, some with theory, discussion, diagrams, photos ,
??? and, as with anything,? some miss-information and some corrections.
There are a lot of YouTube videos,? and ? AmpRepairGuy.com?? has some videos of his repairs.
? Likely others , all requiring sifting the information and reasoning.
Harbach Co.? & CTR Engineering? Kits,? parts for? Mods (depending on the Amp Model):
? Having good instruction,? kits, ? PCB's ?? and downloadable .pdf's at both of these? two? web sites:
Possibly the Richard Measures (SK) Amp Forum, has some priceless,? sometimes buried help:
The "search" bar? { below }? can still dial in the query:
example:
And,
? ....? there seem to be some PCB's? from?? W7RY , although I have not been successful getting adequate answers or actually purchasing the PCB's
thanks,
