| Heathkit HDP-21 
 
   SPECIFICATIONS
| Type: | Dynamic desk microphone |  
| Frequency response: | ? Hz (-6 dB) |  
| Sensitivity: | ? dB (? Hz, ? cm) |  
| Output level: | ? mV |  
| Output impedance / connector: | Hi-Z / Open end |  
| Power supply: | - |  
| Current drain: | - |  
| Dimensions (W*H*D): | ? mm (?") |  
| Weight: | ? g (? oz) |  
| Manufactured: | USA, 1962-1966 (Discontinued) |  
| Other: | This is basically a re-branded Electro-Voice 605 
 New price 1965 in the US: $29.40
 |  
| Related documents: |  |  
| Modifications and fixes: |  |  
| Reviews: |  |  
| Applicable radios: | Many |  |