Kaar Engineering Company logo

Kaar Engineering Company was a pioneer high-tech company along with
Hewlett Packard, Ampex, Apple, Varian, Eimac, and other great companies
of the Silicon Valley region of Northern California.

25 E receiver front panel

---front view of HF Marine Receiver, Model 25-E---
25 E receiver front panel

---1956 magazine ad---
1947 magazine ad

---1947 magazine ad---
25 E receiver top view
---top view of HF Marine Receiver, Model 25-E---
25 E receiver, bottom view
---bottom view of HF Marine Receiver, Model 25-E---


RSA-251M Remote Control Unit

front view of RSA-251M
---front view of RSA-251M Remote Control Unit---
rear view of RSA-251M
---rear view of RSA-251M Remote Control Unit---


AN/FRR-26 R-517/FRR-26 Fixed Frequency HF Receiver

AN/FRR-26 receiver front panel
AN/FRR-26 left interior
---left front---
AN/FRR-26 right interior
---right front---
AN/FRR-26 top view
---top view---
AN/FRR-26  bottom view
---bottom view---
AN/FRR-26 receiver front panel
---rear view---
AN/FRR-26  bottom view
---close up of metal tag---


Other Kaar products

Kaar ad
Kaar 1958 catalog ad
Kaar ad
Kaar 1962 catalog ad
Kaar ad
Kaar 1962 catalog ad
Kaar ad
Kaar 1963 catalog ad
Kaar ad
Kaar 1969 catalog ad
Kaar ad
Kaar 1958 catalog ad
Kaar ad
Kaar 1969 catalog ad
Kaar ad
Kaar 1970 catalog ad

Kaar Engineering Company manufactured products for the military, for commercial radio markets, and
for early CB markets. The AN/FRR-26 probably represents the best of Kaar Engineering Company's engineering talent.
John Kaar started Kaar Engineering Company as a backyard garage company in 1936.
Very little has been documented about this pioneer Palo Alto company that lasted until the late 1960s.

A partial list of its HF receivers are as follows:

c.1947 Kaar Model 23AT HF receiver, 500kHz to 42 MHz, 9 tubes
c.1947 Kaar Model 25 Marine Receiver (25E 7-tube AC version, 1950), 5 crystal frequencies plus 500kHz-5.5MHz VFO
c.1952 Kaar Model AN/VRR-2 (11X) police or military mobile receiver, 1.6 MHz to 2.9 MHz, 6 tubes
c.1952 Kaar Model AN/VRR-3 police or military mobile receiver, 30 MHz to 40 MHz, 10 tubes
c.1960 AN/FRR-26 2-8 MHz, 13 tubes, single fixed crystal frequency

A mystery product is Kaar's Remote Control Unit, Model RSA-251M. I think it is a combination T/R switch and
modulator, but am not sure. It contains the following tubes: 5Y3, 6V6, 6SL7, 6Sk7 (Qty: 3), and 6SQ7.
Also, it has three Triad transformers, Models 1660, 6758, and A-31X.

UPDATE: this entire collection has been donated to CHRS (the California Historical Radio Society)

Related Links:

Kaar relationhip with Fred Terman
Another example of an AN/FRR-26
K4NYW's U.S.Navy Fixed Frequency Receivers
Conalert II receiver

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