Have I been missing all those years?
It sounds much louder than when the linoleum Auratone 5C type speaker is connected. About 2-3 times. Strange how the amp is so low power at these settings, possibly much less than 1W yet it is not desired that system were louder.
One reason is that it has impedance 12Ω which matches closer to the relative high impedance of the BD139. The Tesla 5in speaker is 4Ω. The BD139 was supplied with Vb=12V through series fuse for safety. Bias resistor 12KΩ. Playing the CD albums, Ray of Light - Madonna, Ingenue - KD Lang
This setup can transport to the artists brain. This is what had been thought while listing to the wonderfully played guitars on the Ingenue - K.D. Lang album
Amazing sound with full bass, clear mid, relaxed extended treble.
No crazy wooden box bass, mid bass air standing wave resonamce modes etc.
This wonderful Zeis Ikon speaker baffle was placed spaced in the corner of the reverberant room.
More information on the 31-06 speaker in a previous post.
Also here:
https://www.audioasylum.com/messages/hug/158435/speakers-amp-drivers-by-zeiss-ikon
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