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Re: [Amps] B&W 852 Impedance Measurements

To: Bob Maser <bmaser@tampabay.rr.com>
Subject: Re: [Amps] B&W 852 Impedance Measurements
From: "R.C. Morris" <robrk@nidhog.net>
Date: Thu, 03 Jul 2008 12:40:25 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>
I was confused, again. Should have said 850. The 851 is the little 500 
watt unit.

R.C. Morris wrote:
> Maybe someone moved the taps.
> One of Bill Orr's handbooks talks about moving the taps on the 851.
> Forget if also the 852. Whatever you end up for Pz, one of the taps may 
> be OK, but they don't follow for the other bands.
> 
> I have a pair of 3-500's at 3800 volts with an 851. After 20 years, I 
> forget what band was good, but moved at least three others and replaced 
> the 10 meter coil.
> 
> Figure your plate Z, check the charts, and I think you will need a big 
> solder tool.
> 
> Bob Maser wrote:
>> The B&W 852 that I bought arrived today and is in good condition.  I took 
>> some inductance measurements for each of the band positions and found that 
>> all of them are low as compared to what I thought they should be.
>>
>>             Original Specs                Actual measurement
>>
>> 10            .95 uH                                   .61 uH
>> 15            1.34                                       .96
>> 20            2.34                                     1.67
>> 40            3.72                                     2.56
>> 80            7.00                                     5.41
>>
>> My measurements were made on a AADE unit which has always been very 
>> accurate.  The 852 was not mounted on the aluminum chassis, just sitting on 
>> a wooden bench.  I cannot see any signs of alteration, it all looks stock.
>> In order to use this 852, the Q would be between 15 and 20, very sharp 
>> tuning.  The Original specs correspond to a PLI of 2000 with a Q of ±12.
>>
>> Any comments would be appreciated.
>>
>> Bob Maser  W6TR 
>>
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>>
> 

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