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SB-220

Oldtimer

HEATHKIT SB-220

The stove in the shack

SB-220 Power Amplifier

Home-built year 1975

An RF power amplifier as a kit for DIY. The kits from Heathkit were or are the legends of radio amateurs. With great detail described and illustrated construction manuals that kind of self construction also made for the not so very experienced radio amateur inventors and the development of the device very, very fun. And it fitted and worked mostly everything.

SB-220 Specificationen

Band Coverage

80, 40, 20, 15 und 10 amateur band

Driving Power required

100 Watt

Maximum Power Input

SSB: 2000 watts PEP
CW: 1000 watts
RTTY: 1000 watts

Duty Cycle

SSB: ontinuous voice modulationCW: continuous (max key down 10 minutes)
RTTY: 50% (max. transmit time 10 minutes)

Third Order Distortion

-30 dB or better

Input Impedance

52 Ohm unbalanced

Output Impedance

50 Ohm unbalanced; SWR 2:1 oder less

Front Panel

Tune
Load
Band switch
Sensitivity
Meter switch
Power
CW/Tune - SSB
Plate Meter
Multi-Meter (Grid ma, Rel. Power, High Power)

Rear Panel

Line cord
Circuit breaker ( 2 x 10 A)
Antenna relay (Phono)
ALC (Phono)
RF-Input (SO-239)
Ground post (SO-239)

Tubes

Two 3-500Z

Power Requirement

120 VAC, 50/60 Hz, at max 20 A
240 VAC, 50/60 Hz, at max 10 A

Cabinet Size

14-7/8” wide, 8-1/4” high, 14-1/2” deep

Net Weight

50 lbs

Maintenance and Upgrade

In 1996, I overtook the stage and thereby learned some sections of the device, a hardware upgrade, with kits of the following company:

HARBACH ELECTRONICS, Melbourne, Florida, USA

Specifically, were the following Repair Kits:

  • FB-100Filter Block
  • FM-101Fan Replacement
  • BF-100Bumper Feet Replacement
  • PS-100Parasitic Suppressor Kit
  • RM-100Rectifier Metering Board Replacement
  • SS-100Soft Start Kit
  • SK-220Soft Key Kit



As can be seen today from the Internet is, were the meantime, the names of the kits of the adapted '220 'and now call themselves PS-220, SS-220, etc.
Does not impair the installation, however, as the specifications remain the same!

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Site erstellt: Sep 01 2001

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