AM-FM Radio Model Twenty-One (21)

KLH R&D Co.; Cambridge (MA)

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Country
United States of America (USA)

Manufacturer / Brand
KLH R&D Co.; Cambridge (MA)

Year
1972

Category
Broadcast Receiver - or past WW2 Tuner

Radiomuseum.org ID
155945

Picture
Schematics

AM-FM Radio Model Twenty-One ; KLH R&D Co.; (ID = 620886) Radio — KLH R&D Co.; AM-FM Radio Model Twenty-One (1)

AM-FM Radio Model Twenty-One ; KLH R&D Co.; (ID = 2841494) Radio — KLH R&D Co.; AM-FM Radio Model Twenty-One (2)
eBay item number:225033235198

AM-FM Radio Model Twenty-One ; KLH R&D Co.; (ID = 2841496) Radio — KLH R&D Co.; AM-FM Radio Model Twenty-One (2)
eBay item number:225033235198

AM-FM Radio Model Twenty-One ; KLH R&D Co.; (ID = 2841497) Radio — KLH R&D Co.; AM-FM Radio Model Twenty-One (2)
eBay item number:225033235198

AM-FM Radio Model Twenty-One ; KLH R&D Co.; (ID = 2841498) Radio — KLH R&D Co.; AM-FM Radio Model Twenty-One (2)
eBay item number:225033235198

AM-FM Radio Model Twenty-One ; KLH R&D Co.; (ID = 2841499) Radio — KLH R&D Co.; AM-FM Radio Model Twenty-One (2)
eBay item number:225033235198

AM-FM Radio Model Twenty-One ; KLH R&D Co.; (ID = 2887740) Radio — KLH R&D Co.; AM-FM Radio Model Twenty-One (1)
Original Sound Dampening

AM-FM Radio Model Twenty-One ; KLH R&D Co.; (ID = 2887741) Radio — KLH R&D Co.; AM-FM Radio Model Twenty-One (1)

Technical Specifications

Number of Transistors
10

Semiconductors

Main principle
Superhet with RF-stage

Wave bands
Broadcast (BC) and FM or UHF.

Power type and voltage
Alternating Current supply (AC) / 110-120 Volt

Loudspeaker
Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 4 inch = 10.2 cm

Power out
4.5 W (unknown quality)

Material
Wooden case

from Radiomuseum.org
Model: AM-FM Radio Model Twenty-One - KLH R&D Co.; Cambridge MA

Shape
Tablemodel, with any shape - general.

Dimensions (WHD)
14 x 6.5 x 7.5 inch / 356 x 165 x 191 mm

Notes
This is a later version of the original Model Twenty-One/II which was FM only. Audio stage is identical.

Net weight (2.2 lb = 1 kg)
4.086 kg / 9 lb 0 oz (9 lb)

Author
Model page created by Bill Meacham. See "Data change" for further contributors.

Other Models
Here you find 22 models, 20 with images and 4 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from KLH R&D Co.; Cambridge (MA)

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The model AM-FM Radio is part of the collections of the following members.

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