On Thu, 11 Feb 1999 12:16:28 -0800 Rich Measures <measures@vc.net>
writes:
>
>
>>
>>
>>
>>On Thu, 11 Feb 1999 11:14:47 +0100 Carsten Esch
>><carsten.esch@olympus-software.com> writes:
>>>
>>>Anyone with comments on the above mentioned inductor? How would this
>>>thing work in a
>>>
>>>a. 3CX1500A7 amp
>>>b. 3CX3000A7 amp
>>>
>>>covering 160-10m ? Or should I wound again my own coil?
>>
>>
>>It sounds great but the proof is when it is used and survives several
>>years of tuning.
>
>? amen.
>
>>It also seems a bit of an overkill for an 8877.
>
>? How could we possiblly know this if the dimension of the ribbon
>was
>not given? The tank circulating-current in an 8877 amplifier can
>easily
>be 13A-rms. E>F. Johnson rated their 12.7mm/0.5" ribbon inductors
>(222-series) at 15A.
Gee, your getting touchy. I said "seems" and that was based upon the
dimensions. A coil that you can stick the tube inside with room to spare
just appears a bit excessive.
>
>>Many have reported problems with arcing and parasitics when a roller
>coil
>>is used, particularly the large edgewound Multronics style.
>
>? I used such an inductor in my 8171 amplifier. I shorted the
>unused
>turns with 5/8" strap. There was no arcing at the inductor. However,
>
>there was initially an, intermittent vhf parasite. The cure was to
>use
>a lower vhf-Q anode parasitic-suppressor.
And how many years have you used the coil? How many bands? Hours of
operation daily and number of retunes per day? Or does it just stay on
75M ?
>>
>>Any idea who actually manufacturers the coil? I hope it is not a
>certain
>>West Coast outfit.
>
>? Are you thinking about the mfg. that uses Delrin for coil forms in
>roller coils.?
>
They are in Ohio. The other operation is in your state but the quality is
similar.
>>What is the price?
>>
>? Surplus Sales sells the 5.uH Collins 180t roller-L for $35. Fair
>Radio sells the same item for $10.
I think you slipped a few gears Rich. I'll try again...what is the price
of the discussion inductor???
73 Carl KM1H
>>Regards,
>>>
>>>Carsten, DL6LAU
>>>
>>>? 2-10 kw Power Handling ?
>>>? Taper Wound Front End ?
>>>? Edge Wound Coil All Silver Plated ?
>>>
>>>(IRV)RI-40: It's here at last! The ultimate variable inductor. Isn't
>>>your tuner or amplifier project worth the very best? Made
>exclusively
>>>for Surplus Sales of Nebraska.
>
>
>>>.1-40 uH variable edge wound inductor. Taper wound lower end (higher
>
>>>Q) for better results beyond 20 MHz. Enough inductance for work
>below 160
>>>meters too. All rf surfaces are thick silver plated. Quad 10 amp
>>>contact sets on all rotating connections; coil to rotar; rotor to
>>>shaftarmature; shaft armature to end
>>>plate contacts. There are no weak links with our mil-spec design.
>>>
>? "This ship is absolutely unsinkable due to the use of watertight
>compartments."
>
>>>Perfect for 2-10 kw antenna tuners, tank network for amplifier or
>>>anywhere a larger, high Q, variable inductance is required. Be sure
>to
>>>use our Turns Counter (SHW)TCV.
>>>
>>>5" wide, 5-1/4" high, 12-1/2" end to end, maximum dimensions. 1/4"
>>>shaft. Optional end stop kit for motor drive schemes. Add $ for kit,
>
>>>pn
>>>(IRV)RI-40ESK.
>
>
>
>Rich...
>
>R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
>
>
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