[Heath] HW-10 Power Transformer Testing Questions

[Jeff Goldman]

Since the 6 and 12 volt winding are on the same transformer core, their functioning is going to impact the transformer’s functionality.  Also, the 6 and or 12 volt winding is used to power the filaments in the HW-10.  Us a variac to bring things up slowly and have a fuse in line with the primary.

73,
Jeff, K3DUA





> On Oct 26, 2017, at 1:50 PM, Doug & Kathy Davies <dkdavies3 at gmail.com> wrote:
> 
> Yesterday I managed to get all of the power transformer wires disconnected and ran a continuity test on all of the windings.  The 120vac primary checked out indicating a very low resistance which, I think, shows it's fine.  
> 
> There are two additional primary windings, one for 12 and one for 6 volt operation that utilize a split-reed, dual-interrupter vibrator.  Resistances between connections for each of these windings all showed very low (0.5ohm) resistances.  Since I won't be using either 6 or 12 volts for this rig, values here really don't matter, I don't think :).  
> 
> The resistance between ends of the secondary winding is 52ohms and between the end and the center tap it's 26.6ohms so I think the secondary is ok as well.
> 
> I would like to apply power to this transformer to ensure is is indeed working as it should.  Should I use a Variac/isolation transformer setup to do this?
> 
> The 6 and 12 volt windings require the use of the vibrator so, if this isn't in the circuit, there should be no interaction, correct?  
> 
> There is a tap in the 6-volt primary winding that is used to obtain filament voltage.  I should be able to measure this voltage on the filament lines once 120vac is applied, correct?
> 
> I hope I haven't exceeded my question limit for one post:)
> 
> Doug  VE7DRF
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