>On Fri, Apr 05, 2002 at 01:58:41PM -0800, Richard wrote:
>> >I concur. I don't feel bad for ordering the new caps, I just feel bad
about
>> >the fact that I assumed that they were bad to begin with. There is also
the
>> >heat issue with the bleeder resistors that the Harbach part solves.
>> >
>> Ä How much $ does he get for Caps and equalizer Res.?
>
>He gets $125 for the pack which can be found on his SB220 page:
>http://www.harbachelectronics.com/reference/harpg3cart.htm There is also a
>larger image of the pack:
>http://www.harbachelectronics.com/pictures/fb-220.jpg
>
>The pack includes the caps, a PCB,
? is the PCB for the 8 electrolytics?
>bleeder resistors, and a frame. Given
>that I haven't run the amp yet, I can't attest to the performance, but I'm
sure
>they work fine. However, I am very pleased with the fit and finish of the
whole
>pack as a unit. He uses Cornell-Dubilier 480v 210uF computer grade caps
>which he also sells independent of the pack for $75/8. When looking for
>replacements, the cheapest caps that I was able to find were about $64/8.
>Given the quality of the pack, in my opinion, the price delta of $50 is worth
>it.
>
>> >That was one of the "various things" that I tried which resulted in more
>> >smoke and a tripped breaker. Did I mention the smoke?
>>
>> Ä Yes. The transformer is history.
>
>I'm not surprised.
>
? But, wait: do you own a canoe that needs an anchor?
>> > I'll plan on making a
>> >call to Mr. Dahl and see about getting a replacement, though I'm not sure
>> >what the circuit should look like with a tapped seconary vs. a tapped
>> >primary. Making that change might be beyond my expertise.
>> >
>> Ä I would order a 1200/800 Vrms secondary; dual 120V, 60Hz-only primarys on
>> a core that will fit. Potting is worth the money on a HV transformer. You
>> should be able to switch secondary taps with the extant SSB-CW switch
>> Provided you don't hot-switch (the LV-HV switch needs to go closest to the
>> mid-point on the FWD, which is what Kenwood did on the TL-922) - Dahl's
E-I
>> cores are good. Grade-5 HypersilÆ cores are a bit better, but they do not
>> fit well in the rectangular space available. Dahl's transformers typically
>> have low winding R, so a step-start is advisable. No-load anode potential
>> should be around 3500VDC/2400VDC. P-out should be c. 300w more than stock
on
>> SSB. However, more V =s more VHF gain, so the parasite suppressors need to
>> be improved and glitch protection is not a bad idea.
>
>Parasitic suppressors have already been installed
? Are they the Harbach suppressors with the 4-t suppressor inductors?
>and I'm definitely going to
>adding glitch protection. As a result of this post, someone has offered
>me an original unused transformer which would end up costing less than half
as much
>as a new Dahl unit. I wonder if it would really be worth it for the extra
>300W or so to go with the new Dahl transformer. I welcome opinions.
>
? 300w more than stock is a drop in the bucket, To make a noticeable
difference on a sky-wave HF/MF signal, one must a least double one's PEP.
I would not buy a killer transformer unless I had no option.
>> good luck, with your Heath, Heath
>
>Heh, I shall need it.
>
>
>Thanks,
>
ur welcome, Heath
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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