[Hammarlund] Hammarlund HQ170A

[Roy Morgan]

On Dec 23, 2009, at 11:52 AM, Rick Gouge wrote:

> ...  I also have a HQ170A receiver....That receiver is going on the  
> bench soon for recapping as well.

Rick,

I discovered recently that the HQ-170A has a thing to confuse you.

There are two 330 mH chokes that are located near the rear chassis  
apron to the rear of he side band and selectivity switches.  One is   
the 330 mH choke L5 mounted on T11 and going to Pin 3 on the 6BV8 last  
IF amp triode. That T11 pin is being used as a tie point. Only two  
pins on T11 are actual coil connections.. the one the choke is mounted  
to is not a connection to the coil.  The choke markings are faint  
indeed in my radio, and nearly un-detectable in one other radio I know  
of.  Do not be led astray.

The HQ-170A I have here has all ceramic caps in it, and just a couple  
modern-looking mylar types, along with the many silver micas.  So  
don't order all new bypass caps from the parts list before you upend  
your radio to see what you have.

My radio has a two wire line cord, and .01 1400 volt disk ceramics  
from both lines to chassis.  Do replace your line cord with a three  
wire grounded cord, put one cap from line to neutral and one from  
neutral to chassis.  (Use X and Y rated caps if  you want to do it  
really right.)

I think I'll hoist mine up onto the bench and fire it up to see how it  
runs.

Roy

Roy Morgan
k1lky at earthlink.net
529 Cobb St.
Groton NY, 13073
Home: 607-898-3607
Cell: 301-928-7794