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Alan Hope 28th November 2011 11:47 PM

45 TSE Checkout Fail
Step 1:
B- 220v
Filament voltages R 2.47 L 2.47

Step 2: Add GZ34
Filament glows
10 seconds later major bright sparking in tube
No B+ at any time

Switched off. No obvious damage to board.

Will double check board and post photos tomorrow.

Bad tube? (I only had one GZ34)

All advice gratefully received.

Alan Hope 30th November 2011 12:07 AM

A shorting tube. Ordered another - tested and 1 yr guarantee.

jrobson 30th November 2011 02:05 PM

Good luck with the replacement...
Are you hooking this up to your Sachikos?

Alan Hope 30th November 2011 02:42 PM

Cheapo speakers first of course, then yes this is intended to be my main amp.

I will attach it - still breadboarded to the Sachikos. The TSE will either:

1) Be better (or the same) in which case I have all the stuff sitting here ready to go for the casework.
2) Be not as good - in which case I will consider myself a few $ lighter and wiser.

jrobson 1st December 2011 09:10 AM

Good luck I guess we are in the same boat :)

Alan Hope 8th December 2011 12:20 AM


Originally Posted by jrobson (
Good luck I guess we are in the same boat :)

Is that the "shorted tube" boat or the "Sachikos" boat?

jrobson 8th December 2011 07:22 AM

Sachiko, can't figure out what the hell is up with my board, bought some new CCS's last night.... so we'll see next week if that is it.

jrobson 16th December 2011 02:35 PM

Hi Alan

Did you get your replacement tube?

Alan Hope 17th December 2011 10:04 AM

Yes, it's here.

However after reading the "sparking rectifier tubes" thread, I am going to insert two 100 ohm resistors into the power supply before my next attempt.

Alan Hope 14th January 2012 10:45 AM

New rectifier tube OK, checkout completed uneventfully. Music!

Amp still on breadboard, and now transferred to the big rig (Fostex BLHs). Sounding very good indeed. Some background hum - hopefully casework, motor-run cap, will reduce that significantly.

After 4 or 5 hours critical listening, this amp betters the Decware Zen, in my system, by some distance.

Photos and detailed listening notes to follow.

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