A 6V6 booster amplifier

2006/10/29

 

Subject: A 6V6 amplifier

 

I up-loaded the Michigan Mighty Mite (MMM) in the spring, 2006.

The condx has been poor this year and I needed a bit more power every once in a while so I decided to make a booster amp for the MMM.

 

The amplifier was completed and I have made the first QSO with KI4GLH on Oct. 9 with the power output of 2 watts.  I was excited for the performance of the amp because I designed this amp, and I built this myself so this amp exists only one in the world.  I am learning radios and anything I try is a kind of trial and error basis, not knowing what will happen, Hi.

 

On this project I tried to use the parts and materials I have on hand as much as I could. I had two 6V6 tubes but during the fabrication, the 6.3v heater on the first 6V6 was broken because the wrong wiring.  The second 6V6 I had which was the last one became a bit malfunctioning because I applied about 400 VDC on the B+ as I wanted and tried to generate the most possible power.  The spec says that the maximum plate voltage should not be exceeded more than 315V. I definitely exceeded Hi. My neighbor ham, Frank, VE3FBH, came to rescue me with two more 6V6.

 

I have made a dozen of QSOs with this amp to date and now I wanted to use 6V6 tube as well as 6L6 as the replacement.  6L6 tube can generate a bit more power and I have three 6L6 on hand.  The base connection of the two tubes are the same except no room in the box I used to place 6L6 instead of 6V6.  6L6 is longer than 6V6. Currently I am relocating parts and doing re-wiring to make more room for 6L6.  This is the revision one on this project.

 

The pictures attached show the revision zero when I completed the amp on Oct. 9th.

 

73

ve3cgc@cogeco.ca

Hiro

 

 

IN JAPANESE.

 

6V6 ブースターアンプ:

 

1石トランジスターQRP送信機、the Michigan Mighty Mite(MMM) ではどうしても力不足と感じるCONDXが時々ありました。 もう少しパワーが欲しく、手持ちのパーツと材料を出来るだけ使って、アンプを10月9日に完成し、初めてのQSOをKI4GLHと

できました。

 

このアンプは配線図を自分で考え、2Wから3Wくらいのパワーを出すアンプで、MMMの400mWではどうしても苦しいCONDXの時に使うつもりです。

 

ケースはデスクトップの電源が収まっていた箱と、6V6真空管を使い、出力2Wが特徴です。  写真を2枚添付しますが、組み立てるのに特に難しいところはありません。  もう少しパワーを出せる6L6はピンの位置も6V6と同じで、差し替え可能ですので、今、改造その1としてソケットの位置を変更しています。  写真は今月始めに出来上がった時の物です。

 

ve3cgc@cogeco.ca

Hiro Hayashi

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