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A few pcb's more...

Posted 7th December 2009 at 08:40 PM by Bas Horneman (Bas Horneman's diyAudio.com blog)
Updated 7th December 2009 at 08:58 PM by Bas Horneman

With a dayjob and other "stuff" in my life. I don't always feel like conquering the cold and messy shed to go do some drilling. But I usually have other projects running parallel that I can do something on. Pictured here is the Pass B1 and the lightspeed pcb's. Stuffed...primarily because..... that way I won't loose parts in my messy hobby room.
Click the image to open in full size.

The Kendeill caps were too big for the B1 board. So I soldered the neg terminal to the neg hole in the pcb and wired the plus to the positive rail.

The wires of the 10uF cap I bent to go beneath the pcb and almost touch. I did this on purpose because I have some 0,22uF smd caps that will act as bypass for the Audyn polyprops. They will go between them wires there.
Click the image to open in full size....
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Old

Some more parts arrived for the BH

Posted 26th November 2009 at 09:10 PM by Bas Horneman (Bas Horneman's diyAudio.com blog)
Updated 27th November 2009 at 08:40 AM by Bas Horneman

specifically I wanted to show the deflex washers that I'm planning on using.

Click the image to open in full size.

The deflex washers will probably look ugly. But I'm planning on putting them on top of the aluminium top plate. And having a bolt with separate brass washer "hang" on them. This bolt will then pass through a larger hole in the alu chassis plate to the wooden sub chassis that houses the tubes.

Also got the 470uF/100V caps for the bias blocks.
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Old

Delivery

Posted 20th November 2009 at 06:48 PM by Bas Horneman (Bas Horneman's diyAudio.com blog)

Look what the mailman/woman dropped at my casa.

A matched quartet of GM70's (Almost ashamed at how little I paid for them) GM70's are for a SE GM70 amp with MQ parafeed iron.

And the 500R trimpots and 0,22uF caps for the Baby Huey.

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Old

Ordered 500R pots for the driver stage.

Posted 18th November 2009 at 08:27 AM by Bas Horneman (Bas Horneman's diyAudio.com blog)

And while I was at it I saw some 0,22uF Epcos MKV from the same seller. The Epcos will do duty as coupling cap, as I've seen good reports (anecdotal) on them.

I asked Ian (gingertube) what the 470R resistors were for. Because I figured the CCS would take care of everything of the balance.

Here was his answer:
Quote:
The 1K pot is to set balance in the diff amp. The resistance in the triode cathode degenerates the tube gm (Ia/Vgk). Sweeping the pot wiper from side to side varies the amount of degeneration on each of the 2 triodes until they match. This is the minimum distortion condition for the diff amp. As we don't want to throw away gm un-necessarily we don't want those resistance values too high - just high enough to be able to adjust for matching behavior.
For a random sampling of 12AX7 and ECC803S that I had, 1K was too much, 100R was'nt quite enough so I dropped the 470R on each side of the 1K pot which effectively makes that pot about
...
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