|
Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
|
Thread Tools |
21st Mar 2019, 10:45 am | #1 |
Pentode
Join Date: Jan 2006
Location: Goudhurst, Kent, UK.
Posts: 136
|
DAC90A rewiring/rebuild drawings & Data....
Hi,
I did this Visio & Excel spreadsheet a few years ago - they may be useful for others. I find pictures are easier to follow than text. They detail all the information needed to rebuild a DAC90A from the ground up (if desired!). Please let me know if you find any errors - I've not updated the spreadsheet for a few years (it's a while since I did a DAC90A)... Constructive feedback always welcome... I'm always interested in improving what I do. Please don't redistribute - rather, point folk back here so that errors (if any) do not propagate... Cheers
__________________
Nicko Last edited by Nicko; 21st Mar 2019 at 10:59 am. |
21st Mar 2019, 11:07 am | #2 |
Heptode
Join Date: Jan 2006
Location: Cornwall, UK.
Posts: 506
|
Re: DAC90A rewiring/rebuild drawings & Data....
Thanks for posting this. Looks like good reference material to me. People are always asking what capacitors to use as replacements and the DAC90A is certainly popular.
I'm surprised that you needed to replace several silver mica types though; I find these are usually still ok. |
21st Mar 2019, 11:13 am | #3 |
Hexode
Join Date: Jul 2010
Location: Royal Berkshire, UK.
Posts: 471
|
Re: DAC90A rewiring/rebuild drawings & Data....
I second the big thank you Nicko, and Kaylee20 too, who's name also appeared on the .pdf.
I can see this ending up as a sticky. I've compiled a parts list using RS numbers etc not too long ago, sadly, in recent weeks referring back to my list, turns out these very replacement parts are now obsolete! (Eeek). Mark
__________________
Slowly turning the 'to-do', into 'ta-dah' |
21st Mar 2019, 11:17 am | #4 |
Rest in Peace
Join Date: Mar 2006
Location: N.W. Oxfordshire(Chipping Norton)
Posts: 7,306
|
Re: DAC90A rewiring/rebuild drawings & Data....
Mark, would you mind if I printed that Layout picture for use in my workshop, where I don't have a computer or WiFi access (Workshop is in a cellar) I wouldn't distribute it elsewhere, but simply use it when rewiring a DAC90.
|
21st Mar 2019, 12:37 pm | #5 | |
Pentode
Join Date: Jan 2006
Location: Goudhurst, Kent, UK.
Posts: 136
|
Re: DAC90A rewiring/rebuild drawings & Data....
Quote:
I included an acknowledgement to Kaylee20 as I used his mods in the layout. Also, I tend to minimal replacements. The silver mica etc. is only in there for completeness. Cheers
__________________
Nicko Last edited by Nicko; 21st Mar 2019 at 12:47 pm. |
|
21st Mar 2019, 2:11 pm | #6 |
Octode
Join Date: Aug 2015
Location: Glasgow, UK.
Posts: 1,848
|
Re: DAC90A rewiring/rebuild drawings & Data....
Thanks Nick - a wonderful resource that deserves to be a sticky as Mark mentioned above.
Don't suppose you have any plans for a view of the Top Chassis as the wiring around the dropper and output transformer can get a bit befuddled - or maybe that's just me? It's certainly encouraged me to to revisit my DAC90A restoration which is on-hold at the moment.
__________________
BVWS Member |
21st Mar 2019, 2:19 pm | #7 |
Rest in Peace
Join Date: Mar 2006
Location: N.W. Oxfordshire(Chipping Norton)
Posts: 7,306
|
Re: DAC90A rewiring/rebuild drawings & Data....
O.K., Nick. I realized your name was Nick, when I saw your post over on GVR as well!
|
21st Mar 2019, 2:27 pm | #8 | |
Dekatron
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 7,087
|
Re: DAC90A rewiring/rebuild drawings & Data....
Quote:
My mods entailed drilling a couple of holes to mount an extra tagstrip - which I see you have incorporated. Clearly a fair bit of work has gone into this wiring diagram, Nick! Let's hope it gets plenty of use, and helps people to get the best out of their DAC90a's! |
|
21st Mar 2019, 2:51 pm | #9 |
Octode
Join Date: Aug 2015
Location: Glasgow, UK.
Posts: 1,848
|
Re: DAC90A rewiring/rebuild drawings & Data....
Along with the new tag strip there are a number of new resistors and capacitors - is there any commentary that accompanies these modifications?
__________________
BVWS Member |
21st Mar 2019, 2:57 pm | #10 | ||
Pentode
Join Date: Jan 2006
Location: Goudhurst, Kent, UK.
Posts: 136
|
Re: DAC90A rewiring/rebuild drawings & Data....
Quote:
I've modified the vsdx file to correct kalee20's name - but I can no longer update the original post as the edit timeout has now been exceeded. I don't know if the mods here allow it, but it would be great to be able to keep the top post correct... Quote:
__________________
Nicko |
||