[Heath] SB 100 and SB 102

[G3OOU at aol.com]

In a message dated 19/04/2012 17:23:30 GMT Standard Time,  
kgordon2006 at frontier.com writes:


>  Can someone tell me the specific differences between the SB-100 and
>  the SB -102..I don't have the manual for the SB  100....




Hi All
 
One additional item is that you can use the 6AH6 instead of the 6AU6 in the 
 receiver RF stage but you also need to change another 6AU6 to a 6AH6 or 
use a  balancing resistor on the opposite heater rail to equalise the heater  
currents - the 6AH6 requires 0.45A whereas the 6AU6 requires 0.30A. 
 
Personally I find the SB-101 receiver sensitivity perfectly adequate on all 
 bands except possibly 10m and with an evening noise level of S7-S8 on 80m  
and 160m (special conversion) the extra gain from the 6AH6 is just not  
required.
 
73

Bob

Bob F Burns
C Eng,  FIET, MSE
Amateur Radio Callsign: G3OOU
Registered RSGB  Instructor
G-QRP Member No: 6907; Zone: 14, QRA: IO91WH; WAB:  TQ25
Secretary of Crystal Palace Radio & Electronics Club: _www.g3oou.co.uk_ 
(http://www.g3oou.co.uk/) 
Technical web site: _www.qsl.net/g3oou_ (http://www.qsl.net/g3oou) 
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