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Re: [Amps] SPE amplifiers

To: "Charles H" <>, "Leigh Turner" <>
Subject: Re: [Amps] SPE amplifiers
From: "Jim Thomson" <>
Date: Tue, 10 Nov 2015 05:50:52 -0800
List-post: <">>
###  They rate the SPE 1.3K-FA  amp at up to 1500w  pep out on ssb.   That’s 
It would be an IMD garbage truck  if run at that po.
##  Who is going to repair your amp when it blows up ...esp with no schematic 
available ? 

###  The SPE 2.0K-FA isnt much better..rated at 2.0 kw pep out..using just 6 x 
They are only rated for 300w each, maxed to the peg.   The higher voltage 
version of a 
MRF-151G is called a VRF-151G.    And two of those are used in the ARRL 250w 
pep out amp.
Two of em run very clean, IMD 200-250w pep out.  A friend built that 
amp, and it works
very well.....when run at 200-250 pep out.....and not the  600W  absolute max 
rated output.

##  Even maxed to the peg, 6 of em would be good for 1800w....not 2000.   On 
ssb, 6 of em would be clean
at 600-750w pep out, that’s it.   At the claimed 2000w pep out on ssb, again, 
it would be very poor
IMD products.

##  Is anybody really impressed with the .... 35,000 lines of code built into 
the cpu on these things ?? 

Jim  VE7RF

From: Charles H 
Sent: Monday, November 09, 2015 3:17 PM
To: Leigh Turner ; 'Jim Thomson' 
Subject: SPE amplifiers

I do not read any specs except the output power.
I will never repair my 2K myself.
I enjoy its results and smile while I get 'em first call.
73, Charly

> From:
> To:
> Date: Tue, 10 Nov 2015 08:03:50 +1030
> Subject: Re: [Amps] Question about SPE 1.3K-FA amplifier
> CC:
> Hi Jim,
> I fully concur with all of your points below.
> Someone would have to have lost all of their good sense to even consider
> buying an amplifier without a complete set of detailed schematic diagrams
> and associated Parts List. It is the ultimate insult to their customers and
> the epitome of arrogance for a manufacturer not to do so.
> To be considerate of other band users, one would have to operate the 1.3K-FA
> "linear" amplifier with considerable Po back-off below the amp's rated 1300
> Watts PEP that's well clear of its 1 dB power compression point and
> saturated Po to yield any half-decent / semi-respectable IMD figures.
> Leigh
> -----Original Message-----
> From: Amps [] On Behalf Of Jim Thomson
> Sent: Monday, 9 November 2015 9:45 PM
> To:
> Subject: [Amps] Question about SPE 1.3K-FA amplifier
> Date: Sun, 8 Nov 2015 06:59:35 -0700
> From: Richard Solomon <>
> To: Amps group <>
> Subject: Re: [Amps] Question about SPE 1.3K-FA amplifier
> Here is a link to what looks like the Test Report for
> FCC Type Acceptance.
> Curious as to what folks think about the results.
> ## This is almost as good as an arrl report for basic stuff. 
> Their test method seems a bit flawed imo. You can't test
> any linear amp, by stuffing a 2 tone signal into the mic jack.
> Unless the xcvr is running in class A. In this case, the icom 7800
> used for the test, afaik, does not run class A. 
> ## If SPE cant / doesn't want to provide a schematic for this amp,
> or any of their other amps, I would not touch it, or buy one. 
> ## at least they provide imd info for imd3 to imd11.
> ## The imd test is further flawed.... since they only ran the test at 1000
> w pep out. The harmonic test was run at 1300w out. They are also stated in
> db below pep, and not db below one tone. So u have to subtract 6 db from
> all their tables. IE: their IMD3 on 7.150 mhz is a lousy -27.6 db. (and a
> lousy -24.8 db on 160m and also 10m). Again, re-run the test at 1300w pep
> out, and imd results will be a helluva lot worse.
> ## They need to re-run the test, this time using TWO xcvrs, each feeding a
> cxr into a hybrid etc, then into the input of the amp.....and do it with the
> amp running 1.3 kw pep out. 
> Jim VE7RF
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