Bush DAC 90

[emeritus]

I did wonder if the mains input capacitor was provided to filter the high frequency brush ripple that I understand could be present on some DC mains supplies. Its presence or absence had no noticeable effect on reception on the one I fixed.

[Graham G3ZVT]

I've started a new thread about DC mains
https://www.vintage-radio.net/forum/...76#post1627376

[sparkymike]

I normally use my variac to bring up the voltage slowly on an untested item and this also helps in some cases to re-juvenate the electrolytics I have found.
In a similar vein, I just bought for a friend who has no Paypal, a Rogers Ravensbourne Tuner, stated as "working order when I put it in a cupboard." I found 7 faults before I could switch it on. including no main fuse, no plug, no earth. and others. In addition no panel lights. It could pay in some cases to ask for a photo showing it lit up (or exploding!!) before buying.
Mike.

[kalee20]

Originally Posted by sparkymike

I normally use my variac to bring up the voltage slowly on an untested item and this also helps in some cases to re-juvenate the electrolytics I have found.

I do, too. But 'slowly' for me is over a period of maybe quarter of a minute, not half an hour - operating valves with the heater seriously underpowered while other electrodes have voltages applied isn't good for them (I'm thinking of the rectifier valve).

If you want to reform electrolytic caps, wire a high-voltage silicon diode across the rectifier on a temporary basis and then you can bring up from zero as slowly as you like! Taking it away if you get to 200V with no drama - more than that and you may end up overvolting them due to the lower voltage drop of a silicon diode.

[stevehertz]

Eminently worth buying as a 'collectable', nice looking vintage radio. However, if the intention is to use it to listen to off air radio stations, don't bother. MW stations are fast disappearing and compounding matters the DAC 90 uses an internal aerial, kind of 'purpose designed' to pick up all the indoor interference from digital power supplies.

[Nickthedentist]

I use a DAC90A as a "daily driver" for Radio 4 on LW.

Great sound for a compact set, utterly reliable.

As Steve says, they're prone to a bit of interference, especially from LED lights in my case, but for an AM set with internal aerial, about as good as it gets IMHO.

[Cobaltblue]

Time is up on this one advice has been given and the set is either purchased or not purchased.

I am sure Mike will start a new thread for its restoration if it has indeed been acquired.

Cheers

Mike T