mike stehr
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Posts posted by mike stehr
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7 hours ago, henry4841 said:
I read about Dean's experiment with batteries in a crossover and have wanted to experiment with that design.
Dean sent the parts for free just so I would give my impressions.
Not much of motive for profit on his part with that regard...
Battery bias Cornwall networks
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Television damper tubes like 6AU4GTA work well for audio in the right application.
One will need two for full-wave rectification, but they are tough with rather large cathodes, and indirectly heated.
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6EA7/6EM7
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Er, my bad...I meant I was done wiring. I haven't powered up or tested the unit yet...work and all kinda gets in the way.
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Done
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On 11/9/2021 at 1:07 AM, captainbeefheart said:
What is your experience with the CE multi-section capacitor cans?
I have read about others having bad experiences with the multisectional CE capacitors, but I guess I have been lucky.
My 345A Altec amplifier uses the CE cans. I rebuilt that amplifier in 2008-2009, and I've had no problems.
Knock on wood, however...if the CE can fails, I have a JJ multisectional capacitor that I can swap in.
The only reason I used the CE can cap, is for cosmetics.
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Once by accident I connected a DVD player straight into my 2A3 amplifier playing Slayer...it was rather squishy...
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"born as opposites and at the same time complementary, because one needs the other to amplify the two stereo channels".
I'm sold!
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Ready to wire finally...
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17 hours ago, bribassguy said:
I asked builder to see me a set of 2 way CS500 crossovers but he would not do so unless I bought the entire Type D kit.
Went through the same situation...had the drivers but needed a network.
There is reason they do that which escapes me.
I have a friend with split type D's, so I cheated.
I built a pair of CS500s myself, and Crites did sell some necessary parts like the autoformer and woofer inductor.
In hindsight, I should have just saved my cash and bought the type D kit from Crites.
I would have saved money in the long run, instead of buying bit by bit.
If I were you I would have went the Solen route.
It seemed they put a bit of time/research into the idea.
And they do have a higher range of capacitors other than the common black taped metal polypropylenes.
It may had cost a bit more of course.
Take the networks you have, and swap out the 8.2uF capacitor for your polypropylene flavor of choice.
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Back panel with mounted rocker switch. Plates for binding posts ready to drill...
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Have all the parts ordered except for binding posts and a thermistor.
I didn't like the idea of the having the input jacks on a back plate with AC outlets, then having the input jacks go through and over AC secondary and heater windings to get to the 12AU7 input tube. So I drilled the input jacks on the front of the chassis, as close to the 12AU7 socket as I could get.
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On 9/8/2020 at 8:32 PM, MechEngVic said:
Show the rest!
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Olson transformers made nice OPTs. They (it?) look to be universal...
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1 hour ago, seti said:
Those parts were toasted.
Then dipped in wax.
If carbon composition resistors are hydroscopic, then those resistors are fully saturated with wax.
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PS transformer has been torn down, inspected for broken wires, with the endbells re-painted.
The lamination stack was crooked from heat...I corrected that.
DCR was checked, and then I went ahead and ran the PS unloaded for a couple hours. It sort of got warm...
Voltages with 117VAC go in line with the Pilot schematic...I think it will be okay.
Output transformer DCR numbers match between each other, and should be fine.
Transformer hardware was replaced with stainless steel.
Bought new sockets, with hardware (screws,nuts) being stainless steel. A CE replacement multi-capacitor of 40/40/40uF at 525vdc is on it's way.
I've got the chassis gussied up a bit so far, the wood endcaps are Wenge.
Mike
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And that's that.
No way am I going to deal with wax covered sockets with rotted pins, and rotten wiring.
Whatever magic those parts had, (if any) faded away a long, long time ago.
I'm hoping it's still in the output transformers...
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Original wiring, with burnt screen resistor.
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Picked this up a few weeks ago locally.
I've been wanting a EL84/6BQ5 power amp for some time, and wanted to go the Dynakit ST-35 route.
But due to shortage of parts, that may be some time from now...
Seen the Pilot listed local, and started searching online for information about SA-232. Seems to be some praise, maybe dying off a bit over that last 6 years.
I didn't want another console stereo 6BQ5 push-pull amplifier, but the output transformers looked to be decent size.
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Western Electric SE 300b amp
in Talkin' Tubes
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RH84 uses 12AT7 with good results