[SMCARA] For Sale - SB-220 for parts

[Tom]

Holy cow!  What kind of a dolt substitutes Pentodes (4-400) for Triodes 
(3-500)?  Just because they fit in the socket doesn't ensure success!

I have a couple of original Eimac shipping boxes for 3-500s gathering 
dust.  I'll bring them to Richmond for you.

73 Tom/okw

On 1/25/2016 11:14 PM, Dan Hatcher wrote:
> Folks:
> Have a SB-220 PARTS UNIT available; individual parts are now removed,
> including:
> HV transformer, bias/filament transformer (now rewound -see below), T/R
> relay (have 2), fan (have 2), capacitor bank, bifilar choke, HV plate
> circuity, input coils and band-switch group, both circuit breakers,
> grid/Plate volt/etc. meter, tube sockets, front panel, case, etc.
>
> Also have two  original Heath SB-220 manuals, both  VERY CLEAN; one has pen
> checks on each construction step, otherwise nice white pages and fairly
> clean covers  - $25 ($5 less than copies sell for).
> Other one has NO marks (would make an excellent copy master),  cover has
> some wear  and a penned phone #, spline has wear and ~ 1/3 of the pages are
> loose - $30.
> Also have mod information and several of the Measures/Harbach/QST mods (soft
> start, replacement capacitor bank, replacement fan, meter protection, etc.)
> at quite reasonable (less than 1/2 current prices), so please ask.
>
> Please contact me with needs or questions - I plan to attend our Jan.
> meeting this Thur.; anything remaining will go to Richmond Frostfest in Feb.
>
> Also have a new, still shrink-wrapped MATCHED pair of 3-500ZG (graphite)
> mfg. by RF Parts for $300.
> HRO price is $410.
> Also have several pairs of used 3-500s;
> a. EIMAC, output 800 - 700 w (80 - 10m); 3-500Zs $225, offer.
> b. 3-500Cs - output 750 - 600w (80 - 10m); Chinese mfg.
> c. 3-500Cs - output 650 - 500 w (80 - 10 m); Chinese mfg.
> HRO price for 3-500/C is $169; have never had problems w/ the Chinese tubes
> after 2+ decades of SB-220 use.
>
> Situation is that I, after a hamfest assurance that it worked OK and
> purchase, got it home & discovered it didn't.
> Negative discoveries:
> 1.  Upon power up, it had no bias -
> (one of the few times I've been lied to with a hamfest purchase, some 50+
> years of them).
> 2.  Upon opening up it up, found it had apparently been modified for CB use
> since the 80-40-20 coil was removed & the 15 - 10m coil had 1/2 the windings
> removed.
> 3. Plate current meter was open.
> 4. Had a mis-matched pair of 4-400s (vice the 3-500s) - one EIMAC and one
> GE.
>
> I had 2 SB-220s already so I sent the filament/bias  xfmr away to be rewound
> - wasn't expensive & having a spare might be wise; ,began to investigate
> conversion to a 6m amp.
> Since then, I sold both SB-220s and could never find the TUNE & LOAD
> capacitors for the 6 m. mod. for this amp.
>
> Positive discoveries:
> Hv good, tubes light, Grid/Plate Volt/Rel. Pwr Meter is good, fan works,
> Send/Receive transfer relay contacts look good, etc.
> Has many of the Measure/Harbach mods installed, i.e.,:
> 1. new fan and new 450v capacitors w/ the heat reducing metal film
> resistors.
> 2. new plate resistor suppressors (protects against the ~110 MHz glitch that
> destroys much).
>
> 73
> Dan KD3CQ
>
>
>
>
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