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 Wanted - audio board for AWA B92 radiogram
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 Return to top of page · Post #: 31 · Written at 7:37:18 AM on 18 February 2018.
Brad's avatar
 Administrator
 Location: Naremburn, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 7290

Photo uploaded to Post 28.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 32 · Written at 11:56:16 AM on 18 February 2018.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6678

Nice job! Love the period resistors, too.


 
 Return to top of page · Post #: 33 · Written at 11:27:27 AM on 19 February 2018.
Sue's avatar
 Sue
 Location: Daylesford, VIC
 Member since 13 January 2011
 Member #: 809
 Postcount: 326

The resistors are Soanar, and they're a bit bigger than they need to be, but I buy them because they're very easy to read and check. The modern blue bodied metal resistors are tiny and hard to decode; the blue base shifts the colours of the bands, making red, orange and brown look murkily similar.


 
 Return to top of page · Post #: 34 · Written at 11:52:14 AM on 19 February 2018.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6678

The resistors are Soanar

Good to know. I still have some like that somewhere from many moons ago (probably drifted by now). Agree entirely about the blue-bodied metals.

https://www.soanar.com/Store/Category/Components%20%20%20Switches/Resistors.aspx


 
 Return to top of page · Post #: 35 · Written at 11:03:04 PM on 19 February 2018.
Sue's avatar
 Sue
 Location: Daylesford, VIC
 Member since 13 January 2011
 Member #: 809
 Postcount: 326

It seems that Soanar doesn't sell 0.5 W carbon film resistors, which is a pity because that size is ideal for restoring 70s transistor equipment.


 
 Return to top of page · Post #: 36 · Written at 12:35:00 AM on 20 February 2018.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6678

Yes, strange that they jump straight from 0.25 to 1 watt.


 
 Return to top of page · Post #: 37 · Written at 10:36:41 AM on 20 February 2018.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2363

Those Soanar resistors are carbon film, like the Philips ones.

Carbon and metal film resistors do not drift. They go open circuit under stress and this is usually (but not always) obvious.

When I'm restoring a chassis I normally would not even bother to test a film resistor, that is how reliable they are.

Except where one has been used inappropriately in a circuit with high pulse or steady state voltages (i.e. 500v or more), such as off the anode of a vertical output stage or around the B+Boost or stabiliser circuits. They don't like that kind of service. If the original was a 68k 1w, say, and I needed to replace it with a film resistor, I would use two 33k 1w film resistors in series to spread the peak voltage.


 
 Return to top of page · Post #: 38 · Written at 11:11:04 AM on 22 February 2018.
Sue's avatar
 Sue
 Location: Daylesford, VIC
 Member since 13 January 2011
 Member #: 809
 Postcount: 326

OK, I've got the whole chassis back together, but it's not quite right, so I'll start a thread in the Tech section.


 
 Return to top of page · Post #: 39 · Written at 5:22:42 PM on 7 March 2018.
Sue's avatar
 Sue
 Location: Daylesford, VIC
 Member since 13 January 2011
 Member #: 809
 Postcount: 326

Everything is now working properly.


 
 Return to top of page · Post #: 40 · Written at 6:53:44 PM on 7 March 2018.
Fred Lever's Gravatar
 Location: Toongabbie, NSW
 Member since 19 November 2015
 Member #: 1828
 Postcount: 1245

Hi Sue, how about in special projects and with lots of pix and text about how you did it?
We are a dying breed of people that actually do stuff instead of talking about it!
I don't care if its a small amplifier or a large radio, its how you solve problems that gets me in.
Cheers, Fred.


 
 Return to top of page · Post #: 41 · Written at 10:43:43 PM on 24 April 2018.
Sue's avatar
 Sue
 Location: Daylesford, VIC
 Member since 13 January 2011
 Member #: 809
 Postcount: 326

A good idea, but it's a bit late for a detailed description of this job because it's gone back to its owner. The only photos I have are general shots of the chassis taken after the repair, taken because there's no pictures of the inside of this player online. The worst problem was determining what was missing without reference pictures, and tracing all the loose wires and matching them to the circuit diagram. Really tedious!


 
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