[GreenKeys] [OT] - First Tube Equipment Restoration Project

[Richard Knoppow]

    Jeff is a very good trouble shooter, you have had a wonderful 
offer and I suggest you take it up.
    My opinion is similar, get the instruction book. If you can't 
find one ask here. The full assembly book is best because it 
shows you exactly how the thing was put together.
    Almost every electronic manual has charts showing resistances 
and voltages at the tube sockets. These are very helpful. There 
are some caveats such as being careful to set the controls 
exactly as directed.
    After a certain age you can figure most capacitors will have 
aged and have problems. Tubes sometimes have hard service in 
scopes. If you can borrow a tube tester it will be helpful to 
discover the total duds but keep in mind that sometimes tubes 
test OK but don't work.
    A careful examination of the circuits looking for bad solder 
joints can save you some trouble.
    Make a "dim bulb" tester and fire the thing up. If it works 
you are ahead of the game.
    I have had problems with very old Heathkit scopes with bad 
transformers. Heathkit's first product was a scope and generally 
they were pretty decent ones.

On 6/10/2019 7:58 AM, Jeffrey Angus wrote:
> On 6/10/19 9:16 AM, mwillega wrote:
>> Do I seek out  or build a tube tester or just test in circuit.
> Test in circuit is the easiest.
>> Anything else that I should look out for, besides the usual
>> concerns about high voltages on the chassis, and old degraded
>> components.
> 1st, find a schematic for it.
> 2nd, take your time and replace ALL of the electrolytic and
> paper capacitors. ONE at a time.
> 
> Now you can turn it on and see what it does.
> 
> I repair vintage tube radios and test gear, so feel free to
> pester me with all your questions.
> 
> What model Heathkit scope do you have?
> 

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL