Hallicrafters HT-18 Re-Cap

2007/11/03

 

“Hallicrafters HT-18 re-cap”

 

I got the Hallicrafters HT-18 VFO exciter from W8WLQ, Les, in September 2006.  He pointed out and suggested replacing some capacitors due to the age of equipment.  I operated it without re-cap and it generated 3 watts when switched on, then after about 10 minutes, when it settled, the power steadily was generated at about 1.5 watts.  The VFO can be operated with more power.

 

In September, 2007, this year I started getting the capacitors that will be replaced, doing re-cap project on this old HT-18.  I asked my neighbor ham, VE3FBH Frank, for checking the tubes.  Luckily all tubes on the HT-18 were functioning.

 

RE-CAP (replacing capacitors):

(1)   There are 9 tubular paper type capacitors.  Those tubular paper type capacitors are recommended to replace and install new ones due to being aged.  I replaced 8 capacitors and these are so called “Orange Dip”.   I had to leave one old capacitor because it was installed in a very congested area with other parts.  I simply did not disturb anything and did not screw up.  This VFO is highly valuable to me.

(2)   I also replaced the old electrolytic capacitors in the power supply unit with two new tubular type electrolytic capacitors.  The old one was a can type which was usually used in old radios and the can type new capacitors are extremely difficult to get these days. 

 

Result:

After the re-cap completed, my first QSO for testing was made with WB2QWH, Fritz, on October 28.  The RST I received was 589 and it generated 3 watts of power steadily.     I was impressed with the soft and clean CW note being generated and the frequency was stable on the HT-18.  During the re-cap work, I found that the VFO was assembled in “August 15, 1947” stamped inside the box, because I had to remove the front panel and the box from the chassis.  It was manufactured 60 years ago as marked.  I was amazed with the performance for this old equipment.

 

Some pictures are shown in the album under NOV. 3, 2007.  I welcome you sending e-mail to me for any comment.

 

Thanks, W8WLQ Les, for another excitement and exposure to the old good days.   Also thanks are due to VE3FBH for his great help all the time.

 

 

73

hiro hayashi

ve3cgc@hotmail.com

 

 

 

In Japanese:

「ハリクラフタ―ズ HT-18 VFO

 

昨年9月にW8WLQ より古いVFO ハリクラフタ―ズ HT-18 をいただきました。 W8WLQは電解コンデンサーを取り替えるように勧めてくれました。 電気を入れ送信すると、1.5ワットの送信が出来ましたが、本来この機械はもっとパワーが出るはずでした。

 

今年9月に入り、このVFOに手を入れ、古いペーパータイプのコンデンサーと電解コンデンサーを取り替えるため、部品を集めました。 古い性能が落ちていると思われるコンデンサーを取り替えることを「RE-CAP リキャップ」といい、ハムラジオの機械や古い真空管の受信機では良く行われます。 10月に入り、HT-18に使われている真空管を私の近くに住むVE3FBHフランクに真空管テスターで性能試験をしてもらい、全部の真空管に異常がないことを確認しました。

 

RE-CAP リキャップ」

(1)       ペーパータイプのコンデンサーは9個使われていましたが、その内1個は沢山の部品に囲まれていて、取替えがとても困難に見え、機械自身を壊しかねないので、そのままにし、8個のコンデンサーを取り替えました。

(2)       電源まわりの電解コンデンサーは長い時間が経つと性能が落ち、取り替える方がいいので、新しいものと入れ替えました。 これで、当分は正常に働くはずです。

 

「結果」

(1)   WB2QWH とテストのQSO1028日に行いました。 パワーは3ワット出て、相手からいただいたRSTは589でした。 CWの音もやわらかく、澄んだ音でしたし、安定した周波数で満足でした。

(2)   コンデンサーを取り替える作業のとき、本体が収まって箱とフロントのパネルを取り外しました。 箱の内側に製造年月日「1947815日製造」とスタンプが押してありました。 60年前に造られた機械です。 送信してみての性能に十分満足しました。

 

写真をアルバムの2007113日にところにのせましたので、見てください。 質問などあれば、お答えしますので、メールをください。

 

73.

VE3CGC ひろ はやし

ve3cgc@hotmail.com

 

 

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