That Pentalab data sheet on DXE's? site is incorrect for airflow....(3CX-3000A7) .? ? It's? 67 cfm @ 1.2"? for 4 kw CCS anode diss......and that's for 40 C (104F) intake air temp.? If the actual intake air temp is a more sane? 25 C (77F).....required cfm is even less...and so is the pressure required.? Good to know that the F1 version could have the high mu grid stuffed into it....and ditto with the A3 version.? At least your F1 version is socketless.? ?BTW, Floyd at Eagle made, makes the machined? inner and outer collets, and the grid ring for the? 3000/6000? tubes.? .? Outer Collett is aluminum...as is the grid ring.? The inner Collett is brass.?
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Merrit at RF parts was a good guy..... but these days he's mostly out of the business....and his wife Bonnie...and his son run? RF parts.? ?For whatever reason, Bonnie has a list a mile long of certain parts, including tubes, that she will NOT ship outside the USA.? ?WTF?? ?I wanted a pair of 4.4 uh roller inductors (8 ga wire used).? These were originally made by multronics.....? which was later bought out by Cardwell condenser Corp...which were later bought out by Viking solutions ( which is a clothing company in Lindenhurst NY).? ? The 4.4 uh roller coils sold by RF parts were labelled Cardwell condenser corp.? ? They? (RF parts), filled my big order of items...except the pair of roller coils.
Fine,? I bought 2 x brand new 4.4 roller coils directly from Viking...bam done...in 2 mins flat.??
I even tried getting RF parts to send? the roller coils to Scott in CT..... who would in turn, ship em to me.? ? Not a chance.? I would have to get scott to pay for em...and have em shipped to CT...then ship em to me.? ( that way it was bought and shipped to a usa customer).
Fine,? F#@K you? RF parts.? ?Another goofball outfit that you can't throw money at.?
The 0-4.4 roller coils are well made. I'm going to experiment with one of em, to be used in the manually tuned, tuned input.? ?Before, I used a hb tapped 4 uh coil, made from 6 ga solid copper wire.? The idea behind the roller coil was to be able to change the Q of the tuned input on each band.... and see what the effect is on harmonic output of the amp...and also tuned input Q? vs? IMD? etc.? ?I use a pair of broadcast caps and the coil to make a manually tuned, tuned input.? ?The surplus caps? are 4 x section, with each section 17-540 pf...and all 4 x sections strapped in parallel.? Both caps padded on 160m only.? ?6:1 Jackson bros's ball drives used on each cap.? These were the 4" OD skirt type.? JB also makes a 2"? skirt version.? ?Both skirts are marked 0-100.? ? Another method is to use just the 6:1 vernier, then a small mini turns counter..... then it's? 3 x turns / 300 tiny increments to get from min to max C.?
Jim? VE7RF
