送信管 GU78b GU84b GU74b FU727F を語ろう (104ﾚｽ)
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83(1): 03/27(水)22:54 AAS
FU728F の本来の評価
Poor quality and long term reliability Time Owned: more than 12 months.
While I was also a believer in the hype regarding these tubes. The 1st tube
that I had that I bought with the AMP lasted 1 year. Then i had a real battle finding
good spares. I tried the Ebay route and all the tubes are gassy or failed rejects.
I ordered 6 tubes from different supplies all were gassy and arced over. I did follow
all the procedures to condition the tubes, including running the filaments with grid bias
and heater voltages for 1 week. Same result tube arced over. I went from Ebay to
Ali-express with sellers offering a guarantee for 60 days same thing tubes flashed over
in less than 1 month of intermittent use. Then I bought 2 x tubes from OMpower
省10

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89: 03/31(日)10:55 AAS
>>83
こりゃ酷いもんだな
出始めの頃のオーディオ用中華球と全く同じじゃないか
せめてロシアの軍用球を使わんと信頼性が
アイマックが無くなったのはイタイ

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