Heath HW-8 Final Problem

[Joe Y]

Hello all,
I picked up an HW-8 and noticed it has some strange
issues and I need some ideas and also transistor part
numbers if anyone can help for Q9 the final, Q11
Keying transistor and Q8 Driver.

When I powered the rig on for the first time since
receiving it I noticed it to be down a bit in
sensitivity. The main thing I noticed is that the
meter was showing output in the receive mode and
adjusting the loading control changed the level on the
meter. In adition the rig seemed very microphonic and
would howl and oscillate with changes to the preselect
control.

This effect occurs on all bands. Intertestingly the
rig does key up and transmit with good output.

I removed the final transistor and the sensitivity
restored and output indication disappeared.

I then checked the keying transsitor Q11 and on RX it
is showing 6.5 volts where it should be 0 volts. 

I reinstalled the final and pulled Q11 to see the
effect, I found that with the final in the circuit the
RX is poor almost like its pulling it down, however
with Q11 removed the rig doesnt show output indication
on the meter in RX

My feeling is that the final is bad and Q11 is
suspect?

Tia for any assistance,

73 

Joe 



__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 

-----------------------------------------------------------
Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.aspx?list=HEATH
To post - HEATH at LISTSERV.TEMPE.GOV
Archives - http://listserv.tempe.gov/archives/HEATH.html