[Amps] DRAKE L4B

[Jay Sturtevant]

Robert,

Did you replace the filter caps in the power supply?

Jay, K2ZT

On Thu, Apr 30, 2020, 2:08 PM Robert <woodr90 at gmail.com> wrote:

> Jay, et. El
>
>
>
> The L4B seen in photos was shipped to AGL Electronics around 1973 to 1974.
>
> Original owner was K5TM in Austin, TX
>
> The amp was boxed and stored for about 30 years, that would have been
> around 1990
>
> Tom moved to SC about 2017 and donated amp to local club.
>
> W5AJ bought L4B with donation to club in 2017 and picked up at 2017 Austin
> Summerfest and transported back to Midland.
>
> At Midland, L4B remained in box and wife vacuumed around the PS until “The
> Virus”
>
> which said Virus (and Oil Bust) gave me generous amount of time to work
> old projects!
>
> The amp now sits in my shack.
>
>
>
> Robert
>
> Midland, Texas
>
>
>
> *From:* Jay Sturtevant [mailto:k2ztdx at gmail.com]
> *Sent:* Wednesday, April 29, 2020 10:43 AM
> *To:* Robert <woodr90 at gmail.com>
> *Cc:* Amps at contesting.com
> *Subject:* Re: [Amps] DRAKE L4B
>
>
>
> Robert,
>
>
>
> Nice work on a classic amp!
>
>
>
> Could you give us some general history of your L4 B? Where was it had it
> been kept?
>
>
>
> The tank coil looks heavily oxidized, even flaking, from what I can tell.
>
>
>
> Thanks far sharing!
>
>
>
> Jay,
>
> K2ZT
>
>
>
> On Wed, Apr 29, 2020, 1:25 AM Robert <woodr90 at gmail.com> wrote:
>
>
>
> cleaning up L4B
>
>
>
> posted few photos at
>
>
>
> http://w5aj.eqth.net/drake/drake.htm
>
>
>
> Observations:
>
>
>
> The air cooling / fan is anemic
>
> The plastic fan & metal hub can be rejoined with Gorilla EXPOXY Glue
>
> The undated W5DDW fan article covers parts that are now obsolete.. even
> blowerwheel dot com has no direct replacement
>
> The amp hums bit loud on SSB position
>
> The control/filament connector at back of the Amp section is amazing,
> lasting 50+ years, difficult to push on, the connections are tight!
>
> The connector for activating the amps T/R relay seems unique.  None came
> with this amp
>
> For 50+ year old amp, not bad
>
> Did I mention the cooling air is uninspiring..
>
>
>
> 73 W5AJ
>
>
>
> Robert
>
> Midland, Texas
>
>
>
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