Equipment information

Johnson Viking Thunderbolt Amplifier
Manufacturer
Johnson
Model Viking Thunderbolt
Date
Category: Radio, Communication
Group Amplifier
Description
Information
                                    

The Viking Thunderbolt is a self contained radio frequency
power amplifier capable of CW and AM, SSB or DSB linear
operation over a continuous frequency range of 3.5 to 30
megacycles. The amplifier employs two Type PL175A pentode
tubes in parallel, bridge neutralized, which permits power
inputs of 2000 watts P.E.P. linear with suppressed carrier,
800 watts AM linear, and 1000 watts class C continuous wave.
Drive requirements are approximately 10 watts from a well
regulated exciter for class AB2 linear (SSB and AM)
operation and 20 watts for class C (CW) operation. TVI
suppression, spurious filtering, rigorous shielding, and
parasitic oscillation suppression are included in the
amplifier design.

The complete Thunderbolt amplifier including high voltage,
regulated screen and regulated bias power supplies is
contained in a cabinet 21" wide x II 5/8" high x 16
7/8"deep. The total weight is 120 pounds.

The Thunderbolt is fully protected by fuses and also by a
series screen limiting resistor which limits the screen
dissipation to a safe value even in the event of a complete
bias failure.

These manuals are available for the above equipment:

Johnson -- Viking Thunderbolt -- User Manual
File name Johnson-5500-Manual-Page-1-Picture
Manual Type User Manual
Pages 35
Size 2.00 Mbytes (2095290 Bytes)
Language english
Revision
Manual-ID/Number
Date
Quality Scanned document, all readable.
Upload date
MD5 c2b35a48f4529d8800525a0bc88ab3bd
Downloads 186 since 01 March 2014
Information
A.	INTRODUCTION
Page
B.	INSTALLATION

1.	Unpacking and Inspection

2.	Removal of Amplifier from Cabinet

3.	Transportation Claims

4.	Missing Parts Claims

5.	Power Transformer Installation

6.	Tube Installation	3

7.	Hate Suppressor Installation	3

8.	Neutralization	3

9.	Ground Connections	3 10. Exciter and Thunderbolt
Interconnection	4

a.	Pacemaker	4

b.	Ranger or Viking II or Similar Exciters	5

c.	HT-32	6

d.	20A	8

e.	Navigator	9

C.	METERS, CONTROLS AND FUSES	10

D.	ADJUSTMENT AND OPERATION	11

1.	CW Class C Operation	11

2.	Linear Operation	12

a.	Loading	12

b.	Linear Operation Loading Procedure	13

c.	Exciter Tuning	14

(1)	Pacemaker	14

(2)	Ranger, Viking II or Similar Exciters	15

(3)	HT-32	16

(4)	20A	17

PARTS LIST	19-22
Johnson-5500-Manual-Page-1-Picture
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