Dieselpunk Preamp of Doom and the Beast with Two Backs

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Mike H
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#226 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs

Post by Mike H »

I have no further response at this time.

Image Watching.
 
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Thermionic Idler
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#227 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs

Post by Thermionic Idler »

I don't think this is going to get done by the end of the year. We're going away for the Xmas week and I've been banned from bringing my soldering iron with me.

Anyways... here is tonight's progress. Linking the anodes of each pair (pin 6 unused) with the G2 stopper resistors (5W Kiwames).

Image
Deck: Garrard 301 - Audio Origami PU7 - NW Analogue DH3S
Phono: Pete Millett LR, Lundahl SUT, AMB σ22 PSU
Linestage: Bruno Putzeys Balanced Pre + Hans Polak relay mod, LCDuino control
Power amps: 300B PP 'Symmetric Reichert'
Speakers: FF225WK Big Mets
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IslandPink
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#228 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs

Post by IslandPink »

Phwoar !!
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Irene Idler
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#229 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs

Post by Irene Idler »

Thermionic Idler wrote: Sun Dec 02, 2018 10:19 pm It would have made my life a lot easier if I'd bought two different colours of AWG18! Continuity tester to the rescue...
Image
I can't believe you didn't put everything on hold so you could order the wire in a second colour. Your standards are slipping!
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Mike H
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#230 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs

Post by Mike H »

Thermionic Idler wrote: Mon Dec 17, 2018 11:51 pm and I've been banned from bringing my soldering iron with me.
That is so unreasonable isnt it? :lol:


I remember being mildly scolded or bringing Airfix kits on holiday once when I was a kid, like the holiday was supposed to be a break from all that sort of stuff. What? No gotta have my Airfix fix! Are you mad? Image
 
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Thermionic Idler
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#231 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs

Post by Thermionic Idler »

Mike H wrote: Wed Dec 19, 2018 9:31 pm
Thermionic Idler wrote: Mon Dec 17, 2018 11:51 pm and I've been banned from bringing my soldering iron with me.
That is so unreasonable isnt it? :lol:


I remember being mildly scolded or bringing Airfix kits on holiday once when I was a kid, like the holiday was supposed to be a break from all that sort of stuff. What? No gotta have my Airfix fix! Are you mad? Image
How we suffer for our art.

Last progress of the year tonight, I won't get a chance to do any more before Xmas and New Year. Spot the difference...

Image

Answer: B- connections between fuses and negative bank cathodes, and anode to tag board links.

Next challenge is going to be the grid stoppers as I have to extend the leads a bit - if the resistors are soldered close to the valve pins (as best practice dictates) the leads are a bit too short to reach to the corresponding tag board connection point. I guess that explains the number of these that I've seen built with an inch or more of lead between the pin and grid stopper.
Deck: Garrard 301 - Audio Origami PU7 - NW Analogue DH3S
Phono: Pete Millett LR, Lundahl SUT, AMB σ22 PSU
Linestage: Bruno Putzeys Balanced Pre + Hans Polak relay mod, LCDuino control
Power amps: 300B PP 'Symmetric Reichert'
Speakers: FF225WK Big Mets
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Thermionic Idler
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#232 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs

Post by Thermionic Idler »

Image

Image

No, they're not finished. I was hoping though, by the end of tonight, that I'd have been able to get all of the panels bolted together on both of them so that I'd have an idea of what they'd look like when finished, as a sort of proof of concept.

Despite hours of bolting on bolts, this is as far as I've got with one of them, and the base panels aren't on yet. But at least I can see what they will look like.

What hasn't helped is finding out I'm short of about 10 or so 8mm M3 bolts, I think my supplier screwed up the order. I may also need to re-think some of the other fastenings as the bolts have ended up not going far enough into their corresponding holes for my liking - will probably need some longer ones as a result of that.

Probably won't be much more to report after this for a bit, as I have to get everything packed up in readyness for a house move.
Deck: Garrard 301 - Audio Origami PU7 - NW Analogue DH3S
Phono: Pete Millett LR, Lundahl SUT, AMB σ22 PSU
Linestage: Bruno Putzeys Balanced Pre + Hans Polak relay mod, LCDuino control
Power amps: 300B PP 'Symmetric Reichert'
Speakers: FF225WK Big Mets
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IslandPink
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#233 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs

Post by IslandPink »

Thermionic Idler wrote: Thu Jan 10, 2019 1:10 am What hasn't helped is finding out I'm short of about 10 or so 8mm M3 bolts, I think my supplier screwed up the order.
The order needs to be screwed-up by 10 :D

Must be very frustrating to have to move house now in the middle of this though.
"Once you find out ... the Circumstances ; then you can go out"
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Thermionic Idler
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#234 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs

Post by Thermionic Idler »

Finally got hold of some more of the screws I needed, also I now have 24 EL509's!

The bottom panels still need to go on, but here's what they will look like with the valves fitted: Shades of Atma-Sphere methinks?

Image
Deck: Garrard 301 - Audio Origami PU7 - NW Analogue DH3S
Phono: Pete Millett LR, Lundahl SUT, AMB σ22 PSU
Linestage: Bruno Putzeys Balanced Pre + Hans Polak relay mod, LCDuino control
Power amps: 300B PP 'Symmetric Reichert'
Speakers: FF225WK Big Mets
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Ray P
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#235 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs

Post by Ray P »

Very nice work.
Sorry, I couldn't resist!
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Dave the bass
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#236 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs

Post by Dave the bass »

Mega-Uber-shoddy.
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Cressy Snr
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#237 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs

Post by Cressy Snr »

Those'll look fab all lit up. :D
Sgt. Baker started talkin’ with a Bullhorn in his hand.
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Thermionic Idler
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#238 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs

Post by Thermionic Idler »

Ugh, another setback due to a supplier fail - this time on the part of FPE! :x

The remaining bottom panel is supposed to form a kind of L-shape like the top panel. A channel was specified to be drilled along the panel, such that I could bend it 90 degrees in the right place (exactly the same as what I did with the preamp panels to make the U box). The left hand panel in the picture below shows something like what the result should be:

Image

When bending it, however, I noticed it seemed to put up a hell of a lot more resistance than the preamp panels did, even though the panel thickness and spec for the drilled out channel were exactly the same. Also there was a lot more stretch damage to the anodised surface than occurred with the preamp panels, which didn't seem to make sense.

Image

When I clamped the other panel, I couldn't get that to bend at all. Closer examination revealed that something had clearly gone amiss when the channel was drilled out:

Image

Image

That is a 2.5mm thick panel, and the channel is meant to have been drilled to a depth of 2mm, leaving a portion of 0.5mm thick aluminium to be bent. FPE claim accuracy to 0.1mm so something clearly went wrong here. As these represent over €300 worth of panels, I hope they won't get difficult about manufacturing another set to the specification I provided (which I've just gone back and checked, and cross checked against the spec for the preamp panels).

Oh well, at the end of the day with the house move going on, it won't actually delay things significantly.
Deck: Garrard 301 - Audio Origami PU7 - NW Analogue DH3S
Phono: Pete Millett LR, Lundahl SUT, AMB σ22 PSU
Linestage: Bruno Putzeys Balanced Pre + Hans Polak relay mod, LCDuino control
Power amps: 300B PP 'Symmetric Reichert'
Speakers: FF225WK Big Mets
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Thermionic Idler
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#239 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs

Post by Thermionic Idler »

So after a bit of a hiatus (house move, and the summer months when I cannot bring myself to do anything) here is one completed output stage, ready for wiring into the (yet to be fitted) circuit board...

Image
Deck: Garrard 301 - Audio Origami PU7 - NW Analogue DH3S
Phono: Pete Millett LR, Lundahl SUT, AMB σ22 PSU
Linestage: Bruno Putzeys Balanced Pre + Hans Polak relay mod, LCDuino control
Power amps: 300B PP 'Symmetric Reichert'
Speakers: FF225WK Big Mets
Cressy Snr
Amstrad Tower of Power
Posts: 10552
Joined: Wed May 30, 2007 12:25 am
Location: South Yorks.

#240 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs

Post by Cressy Snr »

Gotta love OTLs haven’t you. :)
Sgt. Baker started talkin’ with a Bullhorn in his hand.
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