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 Is anybody currently streaming into Radiograms etc etc
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 Return to top of page · Post #: 1 · Written at 9:05:11 PM on 5 February 2020.
Vintage Pete's avatar
 Location: Albury, NSW
 Member since 1 May 2016
 Member #: 1919
 Postcount: 1993

Anybody streaming Am stations into radios ,radiograms etc etc ,
If so , I would like to know how it sounds via a computer pluged into a old Radio or Radiograms .
There are lots of free Apps and live streaming stations .
Thanks pete


 
 Return to top of page · Post #: 2 · Written at 9:33:54 PM on 5 February 2020.
Johnny's avatar
 Location: Hobart, TAS
 Member since 31 July 2016
 Member #: 1959
 Postcount: 409

Live stream into a modulator is my way to go.
JJ


 
 Return to top of page · Post #: 3 · Written at 9:38:26 PM on 5 February 2020.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4339

A lot on the American Forum are into doing that from iPads & such. The thing is to recombine stereo to mono, or keep them separate for a stereo set. To provide isolation Transformer coupling is often the go, to put some sort of proper load on the source output.

The next catch is to get sufficient amplitude to drive the audio in with out swamping it; and DC blocking caps may be required to stop the bias being wiped out.

Marc


 
 Return to top of page · Post #: 4 · Written at 9:45:05 PM on 5 February 2020.
Vintage Pete's avatar
 Location: Albury, NSW
 Member since 1 May 2016
 Member #: 1919
 Postcount: 1993

JJ , whats it sound like?
I was thinking of doing it to my 11 77 and it would play in stereo too.
The reason I'm thinking of doing it is because its getting so hard to get good AM stations .
Tonight my reception is very bad and all I can pick up is some yobo speaking Rot .
Music ,i want music , pete


 
 Return to top of page · Post #: 5 · Written at 10:06:58 PM on 5 February 2020.
Johnny's avatar
 Location: Hobart, TAS
 Member since 31 July 2016
 Member #: 1959
 Postcount: 409

Pete, the solid state modulator (hrsa) works really well and it’s fairly easy to fiddle the amount of modulation to carrier ratio.
You could’nt tell the difference between a real AM station.
I have built several valve versions, I think one was called a “mate” and both worked very well.
Prefer the solid state one as can leave it unattended 24/7 happily suppling AM to all the radios around the house.
With my kind of music(The Shadows).
JJ


 
 Return to top of page · Post #: 6 · Written at 10:12:58 PM on 5 February 2020.
Vintage Pete's avatar
 Location: Albury, NSW
 Member since 1 May 2016
 Member #: 1919
 Postcount: 1993

Thanks JJ , ..marcc
Dont mind the shadows either!

Thanks pete


 
 Return to top of page · Post #: 7 · Written at 8:37:26 AM on 6 February 2020.
Robbbert's avatar
 Location: Sydney, NSW
 Member since 18 September 2015
 Member #: 1801
 Postcount: 1379

Here's the Mate: http://messui.polygonal-moogle.com/valves/VR198905.pdf

I have a computer that is my "jukebox", playing music into my "antique" Tandy SA-800 amplifier (bought it in 1977). The computer can be placed online, to play any streaming radio station.

Although I haven't tried using it with valve equipment, I imagine it would just need a pair of 10k resistors to merge the left and right into mono, then a blocking capacitor (if needed). I can't see any great difficulty in trying that.

The Mate is going to require you to build it, but once done it can service many radios at once. It's up to you.


 
 Return to top of page · Post #: 8 · Written at 12:43:43 PM on 6 February 2020.
Vintage Pete's avatar
 Location: Albury, NSW
 Member since 1 May 2016
 Member #: 1919
 Postcount: 1993

Robbert, Thank you.
Thats interesting I just read the link.
Looks good.
Pete


 
 Return to top of page · Post #: 9 · Written at 12:48:44 PM on 6 February 2020.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1904

Hi Pete

The modulator I gave you will do AM mono nicely Or you can connect straight into the Phono inputs on the 11-77 and get stereo.

Direct connection quality approximates CD quality and is generally better than FM radio.

Another idea - you can get Bluetooth modules very cheaply. I made one for Jane's son to go with the Christmas present HMV Stereogram. The device can be found on your phone and paired, you then play anything you like. They used it all the time, sounded good.


 
 Return to top of page · Post #: 10 · Written at 1:01:57 PM on 6 February 2020.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1904

I think the go is an AM modulator paired with a Bluetooth module.

I think I still have one of these Bluetooth modules somewhere, with a case, waiting to be assembled. It also has quite a good FM tuner and USB and SD card playback.

Jaycar has a suitable unit in runout and the Albury store has one. $29. AA2108


 
 Return to top of page · Post #: 11 · Written at 3:00:49 PM on 6 February 2020.
Vintage Pete's avatar
 Location: Albury, NSW
 Member since 1 May 2016
 Member #: 1919
 Postcount: 1993

Hi Ian,
I'll go and buy one today from jay car .
Gotta get some music playing here I'm painting the lounge room.
" Glutton for punishment"
Thanks ian ,
Pete


 
 Return to top of page · Post #: 12 · Written at 4:25:27 PM on 6 February 2020.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4339

The Tandy MMS-10 here has two inputs that means I can hook an older computer & the current one or something else to the second one.

It's 1994 & I actually put the top back on it last night after a session a few days a go reflowing solder to see if I could get an intermittent.

Whist I use separate speakers it actually has a single woofer despite the rest being stereo.

No idea what Vic emergency is on? While I am writing this: He keeps sending two messages of the same one after another? Strange; I have had bad mobile coverage since day one (and they know it) yet in the midst of the chaos no evacuation calls on landline.


 
 Return to top of page · Post #: 13 · Written at 6:00:02 PM on 6 February 2020.
MonochromeTV's avatar
 Location: Melbourne, VIC
 Member since 20 September 2011
 Member #: 1009
 Postcount: 1131

I recently bought a Blu Dento Bluetooth receiver and have it connected into a solid-state pre-amp, which in turn feeds into 10W + 10W U/L P/P EL84 stereo amp. With a iPhone and a $11 a month Spotify account I now have no need anymore for bulky records & CD's taking up valuable space.

The Blu Dento Bluetooth receiver is a rip-off of the more expensive Audioengine B1. That said, it is still pretty good. It has the latest version of Bluetooth (5.0), built in DAC & optical out.

Recently I lashed up a solid-state modulator from a SC project . Couldn't get it to work properly and it had to be right next to the radio to get anything out of it at all. I'm looking for a modulator that will work anywhere around the house.

When I get some time I'll try making up one of Peter Lankshear's MATE.


 
 Return to top of page · Post #: 14 · Written at 11:27:32 PM on 6 February 2020.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4339

Peters "mate" is one of the better ones if your into valves. I did make a signal generator for a particular device. That was a crystal locked job with some trickery using 3/4 of a NAND gate into a dual gate FET.

Still have the circuit & enough bits to make mate. One of the let downs with some of that stuff is the radiator. Certain lengths, poor resonance & bad SWR, even in that short length can kill the OP.


 
 Return to top of page · Post #: 15 · Written at 1:44:43 PM on 7 February 2020.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1904

The one I gave Pete is one of two that I bought 15 years ago as a kit from someone in the US or Canada, It's a very well designed device with PLL synth and switchable 9kHz / 10kHz channel spacing, The compressor is based on a commercial design that's widely used by radio stations. You can of course control how much and how aggressively compression is used

When I used it it sounded very clean without the usual compressor artifacts.

I'll have to look up where it came from when I do the garage cleanup!


 
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