[Elecraft] KPA 500 vs New 1500 watt amp

[Fred Jensen]

So I guess the former rule of thumb, "One Dollar per Watt" has met some 
unspecified death.

73,

Fred ("Skip") K6DGW
Sparks NV USA
Washoe County DM09dn



On 4/21/2017 12:30 PM, Edward R Cole wrote:
> Congrats to all who have wanted a KPA1500 (I'm not currently a prospect):
>
> Interesting misconceptions already "flying"
> "1500w cost three times 500w"
>
> KPA1500 with internal tuner = $5995
> KPA500+KAT500 = $2684.95*
> 5995/2684.95 = 2.23
> *April special price
>
> Power requirement 240vac @ 20A = 4800w
> But likely the amp will draw 1500w/0.7 = 2143w (or so) plus maybe 
> 200-300w for solid-state control ckts
> call it 2400w in round numbers or 240v @ 10A (just my guess)
>
> My 6m 1000w PA draws 50A @ 50v = 2500w (40% eff. with 16 transistors)
> My 2m-8877 1400w PA draws 750ma @ 3700v = 2775w (50% eff. but with 
> tired old tube)
>
> 20A is a convenient 240v value since breakers for that are readily 
> available;  I ran about 45-feet of No. 8 wiring to bring 240vac to my 
> shack where I use a 60A breaker box with a 20A breaker (only tripped a 
> couple times in several years useage - HV flashover & HV transformer 
> failure).
>
> I ran my own 240v run as I tired of waiting five months for the $700 
> Electrician to show up.  I think the 4 cond. No. 8 cable ran about 
> $1.50/foot plus costs for 30A 240v twist lock connectors/outlets & 60A 
> utility box with three breakers.  I see 2v drop on 240vac under load 
> of the 8877.
>
> KPA1500 nice design using separate 50v switching PS.  Many new ham 
> radio PA's coming out that use 50v so this could be multi-use PS. I 
> would like a 2m 1500w sspa using LDMOS to replace the 8877 & HVPS.  
> Not looking for that from Elecraft (I will probably buy a kit from 
> W6PQL).
>
> PS: if I were in market for HF QRO the KPA1500 would be my choice!  I 
> finally upgraded to the KXPA100+KXAT100 for my HF/6m needs (driven by 
> either KX3 or K3/10).
>
> 73, Ed - KL7UW
>   http://www.kl7uw.com
> Dubus-NA Business mail:
>   dubususa at gmail.com
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