Dieselpunk Preamp of Doom and the Beast with Two Backs
- Thermionic Idler
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- Location: Southsea
#121 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs
Here's a pic of the delta 1 and delta 2 boards - they are complete except for the inter-board pin connectors which require referral to the (currently offline) documentation:
The four of these will stack vertically. The two boards on the left are the relay stepped attenuator, the two on the right are the input / output switching boards. Both use telecoms grade relays to do the switching.
On the floor behind me is a box containing various handy things to have when building stuff - various sizes of heat-shrinking, cable ties and other spares type junk that I've just thrown together.
Unfortunately.....
This presents me with a conundrum cos usually, building has to be snuck in during periods when the cat is asleep, otherwise he has a habit of jumping up onto the desk and saying "hey, what ya doing, is that some really precise and delicate soldering you're doing there? I bet I can help..."
The four of these will stack vertically. The two boards on the left are the relay stepped attenuator, the two on the right are the input / output switching boards. Both use telecoms grade relays to do the switching.
On the floor behind me is a box containing various handy things to have when building stuff - various sizes of heat-shrinking, cable ties and other spares type junk that I've just thrown together.
Unfortunately.....
This presents me with a conundrum cos usually, building has to be snuck in during periods when the cat is asleep, otherwise he has a habit of jumping up onto the desk and saying "hey, what ya doing, is that some really precise and delicate soldering you're doing there? I bet I can help..."
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
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
#122 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs
I have a similar workshop assistant. Her timing is impeccable - just when I'm set to perform the most fiddly job is when she'll choose to jump onto my lap to seemingly inspect/check that I'm doing it right.Thermionic Idler wrote: ↑Fri Oct 20, 2017 6:22 pmThis presents me with a conundrum cos usually, building has to be snuck in during periods when the cat is asleep, otherwise he has a habit of jumping up onto the desk and saying "hey, what ya doing, is that some really precise and delicate soldering you're doing there? I bet I can help..."
Another of her part tricks is to go through the laundry basket - we'll often come home to find that she has selected socks and deposited them around the house. Funny thing is that is only particular socks and she ignores the rest.
Sorry, I couldn't resist!
#123 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs
AMB website is back up.
- Thermionic Idler
- Old Hand
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- Joined: Sun Apr 22, 2012 8:22 pm
- Location: Southsea
#124 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs
Thanks for letting me know Steve.
As a result I was able to populate the top side of the logic board this morning - this is the brain of the whole thing:
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
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
- Mike H
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#125 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs
Is it not possible to save off the information?
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
- jack
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#126 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs
Been looking at the AMB site - nice!
Vivitur ingenio, caetera mortis erunt
- Thermionic Idler
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- Location: Southsea
#127 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs
Yes he has some quite toothsome stuff there. The A24 linestage circuit is also used as the output stage in the top end Gamma 3 DAC, the only difference being that a low pass filter is implemented for the DAC (the linestage is wide open to 1 Mhz).
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
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
- Thermionic Idler
- Old Hand
- Posts: 1018
- Joined: Sun Apr 22, 2012 8:22 pm
- Location: Southsea
#128 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs
Well, dressing this lot was fun.....
Power supply boards wired up to AC.
Power supply boards wired up to AC.
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
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
- Thermionic Idler
- Old Hand
- Posts: 1018
- Joined: Sun Apr 22, 2012 8:22 pm
- Location: Southsea
#129 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs
Input / output socket wiring installed with Molex connectors, ready to interface to the I/O / attenuator relay stack. Not one of my favourite jobs!
To the right are two tools that probably saved me a significant amount of time and bother. A molex terminal crimper (though not the official Molex one as they charge a feckin' fortune for it - this one is a ratcheting device from a UK seller on eBay for about £21 I think, superior to the really cheap ones on Ali Express and as far as I could see did just as good a job as the £200+ Molex tool). The other thing is a set of wire twisting pliers I got from Machine Mart.
To the right are two tools that probably saved me a significant amount of time and bother. A molex terminal crimper (though not the official Molex one as they charge a feckin' fortune for it - this one is a ratcheting device from a UK seller on eBay for about £21 I think, superior to the really cheap ones on Ali Express and as far as I could see did just as good a job as the £200+ Molex tool). The other thing is a set of wire twisting pliers I got from Machine Mart.
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
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
- Thermionic Idler
- Old Hand
- Posts: 1018
- Joined: Sun Apr 22, 2012 8:22 pm
- Location: Southsea
#130 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs
We're done! Well, almost, I have to fit the IC's into the delta boards and then start all the various power-up tests - so I have no idea at this point whether it's all going to work!
Time for a little break I think...
Time for a little break I think...
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
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
- IslandPink
- Amstrad Tower of Power
- Posts: 10041
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- Location: Denbigh, N.Wales
#131 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs
Haven't you missed out the valves ?
"Once you find out ... the Circumstances ; then you can go out"
- Cressy Snr
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#132 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs
That is looking mighty fine Dave!
Sgt. Baker started talkin’ with a Bullhorn in his hand.
- Mike H
- Amstrad Tower of Power
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#133 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs
Yep.
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
- Thermionic Idler
- Old Hand
- Posts: 1018
- Joined: Sun Apr 22, 2012 8:22 pm
- Location: Southsea
#134 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs
It's alive!!
So far:
- all power supplies measure up perfectly
- it's successfully learned all the remote control commands
- the first I/O board of relays checks out OK.
Now to add more delta boards and continue testing.
So far:
- all power supplies measure up perfectly
- it's successfully learned all the remote control commands
- the first I/O board of relays checks out OK.
Now to add more delta boards and continue testing.
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
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
- Thermionic Idler
- Old Hand
- Posts: 1018
- Joined: Sun Apr 22, 2012 8:22 pm
- Location: Southsea
#135 Re: Dieselpunk Preamp of Doom and the Beast with Two Backs
Testing complete and it appears to be working perfectly! So far only used with unbalanced inputs / outputs but first impressions are extremely good - crystal clear, pretty damn close to a straight piece of wire with gain which is what you want an active linestage to be.
Photograph taken in the rack - I've tried, and failed, to capture what the VU meters look like backlit with proper incandescent bulbs - just like a 1930's wireless. I'll need to take another in the daylight, I think.
Photograph taken in the rack - I've tried, and failed, to capture what the VU meters look like backlit with proper incandescent bulbs - just like a 1930's wireless. I'll need to take another in the daylight, I think.
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
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