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Re: [Amps] HV Diodes

Subject: Re: [Amps] HV Diodes
From: Louis Parascondola via Amps <>
Reply-to: Louis Parascondola <>
Date: Fri, 17 Oct 2014 06:40:32 -0400
List-post: <">>
Alpha has been using those tubes because they get them cheap from China.  You 
can by 2 maybe 3 of them for the price of one Eimac 8877.  Although the Chinese 
do make 8877's and 3cx800's now.  There has to be a reason why they don't go to 
3cx3000 tubes and I  am pretty sure it's not money reasons.  Must have 
something to do with size or certifications.

-----Original Message-----
From: Jim Thomson <>
To: amps <>
Sent: Fri, Oct 17, 2014 5:33 am
Subject: [Amps] HV Diodes

Date: Fri, 17 Oct 2014 03:40:41 -0400
From: Louis Parascondola via Amps <>
Subject: Re: [Amps] HV Diodes

##  Why alpha screws around with silly tube lineups over the years is beyond 
A buddy just bought their dual 4CX-1000 amp.
Why didn’t they just use a single 8877 like their 8877 auto tune amp ?   The 
2500w SS amps will cost two arms and both legs. 
Gimme a single 3CX-3000A7 any day.  50w of drive = 1500w out.  100w = 2.5 kw    
150w = 3.5 kw    200w = 5.2 kw
IMD is superb  at 5 kw out...  -59db pep.  Takes 45 secs to dial up pre-sets to 
change from the highest band to the lowest band. 
You cant blow the tube up..and its dead simple.   A single or dual  8877 is 
simple too.  A SS 1.5 kw  rtty  amp is not gonna be cheap.
Then toss in the  1.5 kw rated LP filters for each band,  RF deck,  pwr supply, 
+ 1.5 kw CCS  auto it doesn’t blow
its brains out  with a 2:1  swr, etc, ..and you can  see why its expensive. 

Jim  VE7RF 

we  have been waiting on that dual 8877 amp with roller inductor for some time 
now.  Many die hard hams would prefer that over solid state.

-----Original Message-----
From: Dan Simmonds <>
To: Carl <>
Cc: Amplifier Mailing List <>; Manfred Mornhinweg 
Sent: Thu, Oct 16, 2014 8:38 pm
Subject: Re: [Amps] HV Diodes

Perhaps, yes. But regardless of how inexpensive the Chinese amps may be, 
at the end of the day they will still be Chinese amps, metaphorically 

Exciting things to come in 2015 in the QRO solid state market. Trust me 
on this :)

Dan  KK3AN
> The Chinese have some serious amps but no US certification yet that Im 
> aware of. Once they get going watch out! They are already taking over 
> the tube business.
> Carl
> KM1H
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