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Amplifier Production Dates

Alpha Amplifier Advertisements Through The Years

MODEL TUBES OUTPUT POWER BANDS TUNING T / R SWITCHING PRIMARY POWER DIMENSIONS
87A Eimac 3CX800 (x2) Legal Limit 160m - 10m Fully Automatic QSK, PIN Diode (keying voltage = 12vdc,12ma) 240vac Hipersil Xfmr (3.5kVA) 7"h x 17.3"w x 16.5"d
99 Svetlana 4CX800 (x2) Legal Limit 160m - 10m Manual QSK, Vacuum Relay (keying voltage = 25vdc,7ma) 120/240vac Unisil Xfmr (3+ kVA) 7.5"h x 17"w x 15.5"d
91B Svetlana 4CX800 (x2) Legal Limit 160m - 10m Manual QSK, Vacuum Relay (keying voltage = 25vdc,7ma) 120/240vac Unisil Xfmr (3+ kVA) 7.5"h x 17"w x 15.5"d
89 Eimac 3CX800 (x2) Legal Limit 160m - 10m Manual QSK, PIN Diode (keying voltage = 12vdc,12ma) 240vac Hipersil Xfmr (3.5kVA) 7"h x 17.3"w x 16.5"d
86 Eimac 3CX800 (x2) Legal Limit 160m - 10m Manual QSK, PIN Diode (keying voltage = 10vdc,1ma) 240vac Hipersil Xfmr (3.5kVA) 7.5"h x 17"w x 15"d
78 Eimac 8874 (x3) Legal Limit * * 160m - 10m (except 12m) Manual and Pre-tuned (Bandpass) QSK, Vacuum Relay (keying voltage = 23vdc,3ma) 120/240vac Hipersil Xfmr (2.4kVA) 7.5"h x 17"w x 14.75"d
77Sx Eimac 8877 (3CX1500) (x2) Legal Limit 160m - 10m (except 12m) Manual QSK, Vacuum Relay (keying voltage = 20vdc,2ma) 240vac Hipersil Xfmr 11"h x 19"w x 22"d
77Dx Eimac 8877 (3CX1500) (x1) Legal Limit 160m - 10m (except 12m) Manual QSK, Vacuum Relay (keying voltage = 20vdc,2ma) 240vac Hipersil Xfmr 11"h x 19"w x 22"d
77D Eimac 8877 (3CX1500) (x1) Legal Limit 80m - 10m (except 12m) Manual QSK, Vacuum Relay (keying voltage = 20vdc,2ma) 240vac Hipersil Xfmr 11"h x 19"w x 22"d
77 Eimac 8877 (3CX1500) (x1) Legal Limit 80m - 10m (except 12m) Manual QSK, Vacuum Relay (keying voltage = 55vdc,85ma) 240vac 9.5"h x 17"w x 17"d
70-V Eimac 3CV1500 (x1) Legal Limit 80m - 10m (except 12m) Manual Vacuum Relay 240vac 9.5"h x 17"w x 17"d
70-A Eimac 3CX1000 (x1) Legal Limit 80m - 10m (except 12m) Manual Vacuum Relay 240vac 9.5"h x 17"w x 17"d
76CA * Eimac 8874 (x3) Legal Limit * * 160m - 10m (except 12m) Manual Open-frame Relay (keying voltage = 25vdc,75ma) 120/240vac Hipersil Xfmr (2.4kVA) 7.5"h x 17"w x 14.75"d
76PA * Eimac 8874 (x3) Legal Limit * * 160m - 10m (except 12m) Manual Open-frame Relay (keying voltage = 25vdc,75ma) 120/240vac (1.5kVA Xfmr) 7.5"h x 17"w x 14.75"d
76A * Eimac 8874 (x2) Legal Limit * * 160m - 10m (except 12m) Manual Open-frame Relay (keying voltage = 25vdc,75ma) 120/240vac (1.5kVA Xfmr) 7.5"h x 17"w x 14.75"d
76C Eimac 8874 (x3) Legal Limit * * 160m - 10m (except 12m) Manual Open-frame Relay (keying voltage = 25vdc,75ma) 120/240vac Hipersil Xfmr (2.4kVA) 7.5"h x 17"w x 14.95"d
76P Eimac 8874 (x3) Legal Limit * * 160m - 10m (except 12m) Manual Open-frame Relay (keying voltage = 25vdc,75ma) 120/240vac (1.5kVA Xfmr) 7.5"h x 17"w x 14.95"d
76 Eimac 8874 (x2) Legal Limit * * 160m - 10m (except 12m) Manual Open-frame Relay (keying voltage = 25vdc,75ma) 120/240vac (1.5kVA Xfmr) 7.5"h x 17"w x 14.95"d
374A Eimac 8874 (x2) Legal Limit * * 160m - 10m (except 12m) Manual and Pre-tuned (Bandpass) Open-frame Relay (keying voltage = 25vdc,75ma) 120/240vac (1.5kVA Xfmr) 7.5"h x 17"w x 14.75"d
374 Eimac 8874 (x3) Legal Limit * * 80m - 10m (except 12m) Manual and Pre-tuned (Bandpass) Open-frame Relay (keying voltage = 23vdc,95ma) 120/240vac 7.5"h x 17"w x 13"d
274 Eimac 8874 (x2) Legal Limit * * 80m - 10m (except 12m) Manual Open-frame Relay 120/240vac 7.5"h x 17"w x 13"d

* NOTE: All 3 models in 76A family have 76A on front panel. Differences are as above. Hipersil transformers are black epoxy coated and have rounded corners.

** NOTE: "Legal Limit" as defined by the FCC when these amps were manufactured was 1 Kw DC INPUT (2 Kw PEP INPUT).