Finally, an Eico HF-81

[Glassweights]

Treble switch

These are goofy rigs, the on/off is part of the treble control, balance is called "focus"..... Which to me is part of the attraction.

Cool though, I love how they look light, but actually weigh about the same as a concrete block!

You know,

using the treble switch for on off might mean that it is functional for longer since most people would probably not have the treble turned down to the bottom third of the pot that gets damaged with the repeated on/off action.

(Whereas it does seem to really bug people having the first third of a volume pot uneven)

Very forward thinking - or maybe it was just a mistake that turned out well

Dan

 

[specialidiot]

They really had ceramic caps in places important enough you put Paper in Oil caps in their place?

That is just mind boggling how much of an upgrade that is going to be. or are my eyes fooling me?

I let Jim McShane select all of the caps for me, I felt lucky to grab the correct end of the soldering iron.

Nice work!

Let's save those kind of comments to when I get the right channel sorted out.

 

[Glassweights]

Oh, you will

It is always something after you work on them.

The trick is to figure out what part of the circuit is not working and go from there.

It is a pain. I am about to shrink wrap all of my probe except the tip since I keep being clumsy and shorting leads together. And I plan to find my clip for my ground lead so I can work with one hand.

I liked the ideas presented earlier on swapping parts of the circuit side to side.

I do a lot of that, not sure if it really helps, sometimes what helps the most is just working with the circuit until I understand what it is not doing right enough for the light bulb to come on in my head.

Dan

 

[specialidiot]

guys you can see the finished product at http://www.audiokarma.org/forums/showthread.php?p=3616258

 

[mashaffer]

I think the reason for the power switch on the treble (and they did it on a lot of gear) is so that when someone turns it on and doesn't wait for the tubes to warm up ("why the 7734 isn't this thing playing" ... twist) they don't blow out the speakers. They just get very bright sound.

mike