[Elecraft] KPA 500 vs New 1500 watt amp

[Nr4c]

A long time ago. The KPA500 is over $4 per watt. 

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...nr4c. bill


> On Apr 21, 2017, at 6:42 PM, Fred Jensen <k6dgw at foothill.net> wrote:
> 
> 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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