08-06-2011, 10:57 AM
I use two bench speakers. For the early high impedance radios I use an Atwater Kent Model E2 but any of the E series works well. You can get one these, or the RCA's (Model 100?) for $50 or less. On the end of the speaker lead I've soldered a few feet of modern flexible wire with one inch pieces of large gauge bus wire that connect to the radio.
For the low impedance speaker I use a generic wide range 8" PM type. Mounted on this speaker is a generic 8 henry choke and a push-pull audio transformer. The interconnections between these are done with Anderson Power Pole connectors; they make it very simple to configure the radio output connections. For the connections to the radio I simply use clip leads with insulating hoods or tack solder.
The push-pull transformer allows me to make connections for single or push-pull outputs. For single ended I simply do not connect one side of the input. Some techies will scream "mismatch", and "Danger, Will Robinson!" but this application is for short term use and fine for the bench.
For the low impedance speaker I use a generic wide range 8" PM type. Mounted on this speaker is a generic 8 henry choke and a push-pull audio transformer. The interconnections between these are done with Anderson Power Pole connectors; they make it very simple to configure the radio output connections. For the connections to the radio I simply use clip leads with insulating hoods or tack solder.
The push-pull transformer allows me to make connections for single or push-pull outputs. For single ended I simply do not connect one side of the input. Some techies will scream "mismatch", and "Danger, Will Robinson!" but this application is for short term use and fine for the bench.
Pete AI2V
