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In Reply to: RE: "Mullard GZ34 rectifier tube" posted by 1973shovel on September 12, 2013 at 05:18:10
The dim bulb tester didn't work. I tried it with a lamp connected to the top outlet, flipped the switch, got a soft "pop," and nothing else. No current through the outlet. Ran continuity tests, they confirmed something shorted in the outlet.
So...I plugged in the ST 70, hooked an iPod and a pair of test speakers and there was nothing to worry about all along. It plays loud and sweet.
Later on tonight or early tomorrow morning, I'll let it get good and hot on the work bench, set the bias, give 'er a try with my MMGs.
And Stax SR-5s.
Addendum: I did let it idle for about an hour and a half. Checked the bias, it was damned near perfect.
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The little old ladies wait in wild anticipation for the meetings of the Double-A-C-ASSN...
Edits: 09/15/13Follow Ups:
I was hoping it wasn't your amp which went "pop".
As I mentioned in one of my earlier posts, I felt it was probably OK to just turn your ST-70 on, but I didn't want to encourage "probably". It would have been different had it been in storage for the last ten or twenty years.
I'm glad the came up strong. I hope you enjoy it driving your MMG's. Please keep us posted!
Quality over quantity.
My "blow out the walls with sound" days are over anyway.
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The little old ladies wait in wild anticipation for the meetings of the Double-A-C-ASSN...
Ain't that the truth?
I remember trying a couple of tube amps (Marantz 8B and Dynaco ST-70) on my Dhalquist DQ-10s back in the late 1980s. Prior to that, I had been driving them with an SAE 100 WPC amp, using an Audio Research SP3-A-1 for many years.
Dahlquist minimum recommended power was something like 50 or 60 watts, and their literature cautioned that clipping on lesser amps would burn out the tweeter.
A guy in the audio club I belonged to lent me the Marantz, and I had one of those "jaw dropping" moments. I always thought the ARC preamp, along with an amp recommended by The Absolute Sound would have been just fine. But using a low wattage tube amp sounded SO much more like music.
I've been a tube amp guy (other than my Pass First Watt F1J) ever since.
I'm happy to hear the amp is working so well, and making you so happy!
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