[Amps] question about SPE 1.3K FA amp

amsctalx at comcast.net amsctalx at comcast.net
Thu Nov 12 11:18:37 EST 2015

Quadras aren't bullet-proof; the RF deck seems to be rather solid but the control circuitry is another topic entirely. I don't have the schematic at hand, but the Quadra has an unregulated DC "sub-supply" ahead of the main logic board to provide Yaesu transceiver-controlled power switching. This supply uses "fuse resistors" to provide protection and drop the voltage to the logic board, and there is a tendency for these to open in the presence of relatively mild transients. This requires opening the amp up to the core and replacing devices that are rapidly becoming obsolete. It takes a rather substantial line conditioner ahead of an amp to help prevent this from happening on a routine basis. The Quadra tuners, which I realize are not the primary reason for buying the amp, struggles to make matches within the advertised impedance range. 

They're great amps, but hardly perfect and that's why I'm one of the people that replaced them with Experts. 


Mike - N8MSA 

----- Original Message -----

From: "Doug Renwick" <ve5ra at sasktel.net> 
To: "Richard Solomon" <dickw1ksz at gmail.com>, amps at contesting.com 
Sent: Thursday, November 12, 2015 10:29:44 AM 
Subject: Re: [Amps] question about SPE 1.3K FA amp 

Why in the world would you replace a bullet proof Quadra with a SPE 1.3K-FA? 
Power output is essentially the same for all bands. 


I wasn't born in Saskatchewan, but I got here as soon as I could. 

-----Original Message----- 

The SPE 1.3K-FA comes with a 2 Year Warranty. 
Warranty work (for the most part) is done here in 
the States. 

With that kind of Warranty SPE must be very 
confident in the Amps survival. 

Mine should be here this week !! It will replace a 
YAESU Quadra. 

73, Dick, W1KSZ 

This email has been checked for viruses by Avast antivirus software. 

Amps mailing list 
Amps at contesting.com 

More information about the Amps mailing list