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Old 11th Dec 2021, 4:04 pm   #121
bobhowe
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Default Re: My FM converter for tube radios using the dial and tube amplifier

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Originally Posted by FERNSEH View Post
Bush DAC90A: Attachment shows a suggested location for the FM module.

DFWB.
Hi David following your thread with great interest
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Old 15th Dec 2021, 5:31 pm   #122
murphyv310
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Default Re: My FM converter for tube radios using the dial and tube amplifier

Hi.
The Module has now been fitted to the Pye P75. Results are certainly improved in comparison to the first module I received.
The popping on tuning is far far less than before, also the way you can calibrate and swap over the tuning direction is a great help. Audio is also improved as previously it was far too toppy, although it is still erring on the the side of a lot of treble a small change of value regarding the tone corrector capacitor cures the issue.

So far so good. The downside is the background noise, which is no better than the first module, no issue on loud music but on classical or speech its intrusive. A friend did mention that the issue could be that the digital and analogue earths are common and the digital noise is getting into the analogue output, or perhaps its lack of filtering?
Big improvement now though.
Video here: https://youtu.be/3duMHylcHKs
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Old 15th Dec 2021, 6:25 pm   #123
Gabe001
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Default Re: My FM converter for tube radios using the dial and tube amplifier

It's that's the case Trevor, the bs0505 isolator (or equivalent depending on the voltage requirements of the module) I use for Bluetooth modules may do the trick
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Old 15th Dec 2021, 6:32 pm   #124
murphyv310
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Default Re: My FM converter for tube radios using the dial and tube amplifier

Hi.
Here is a picture of the installation. I added a wickman fuse, 1N5417 rectifier, 1000uf then a 10ohm series resistor to a further 1000uf smoother to feed the module, with a resultant 7.2v a 0.047uf from the output of the module followed by a 22k resistor to the audio input of the volume control cct.
Attached is a photo of the install.
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Old 24th Dec 2021, 7:03 am   #125
FStephenMasek
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Default Re: My FM converter for tube radios using the dial and tube amplifier

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Hi it was me asking for pictures would it be possible to post some pictures of the module fitted inside thanks
Yes, I mounted with a few dabs of silicone caulk.
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Old 25th Dec 2021, 7:30 pm   #126
murphyv310
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Default Re: My FM converter for tube radios using the dial and tube amplifier

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Hi it was me asking for pictures would it be possible to post some pictures of the module fitted inside thanks
Yes, I mounted with a few dabs of silicone caulk.
Hi.
Is that the silicone that you can buy from a builders merchant? If so it contains acetic acid and will corrode the board gradually. A few dabs of hot melt glue is much better.
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Old 28th Dec 2021, 12:34 am   #127
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Default Re: My FM converter for tube radios using the dial and tube amplifier

In the initial post I read this:
"It's limited to the europan 75µs / 87.5-108MHz band and works great."
Is Europe 75µs ? I think Australia is 50µs
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Old 28th Dec 2021, 3:47 pm   #128
Graham G3ZVT
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Default Re: My FM converter for tube radios using the dial and tube amplifier

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In the initial post I read this:
"It's limited to the europan 75µs / 87.5-108MHz band and works great."
Is Europe 75µs ? I think Australia is 50µs
I don’t think that's a game changer, particularly if your radio has a tone control to remove any excessive treble.
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Old 15th Feb 2022, 11:30 pm   #129
FStephenMasek
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Default Re: My FM converter for tube radios using the dial and tube amplifier

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Quote:
Originally Posted by FStephenMasek View Post
Quote:
Originally Posted by bobhowe View Post
Hi it was me asking for pictures would it be possible to post some pictures of the module fitted inside thanks
Yes, I mounted with a few dabs of silicone caulk.
Hi.
Is that the silicone that you can buy from a builders merchant? If so it contains acetic acid and will corrode the board gradually. A few dabs of hot melt glue is much better.
The acetic acid evaporates in a few hours as it cures.
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Old 16th Feb 2022, 8:49 am   #130
david winter
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Default Re: My FM converter for tube radios using the dial and tube amplifier

peter: modules are either programmed for 50µs or 75µs depending on whether the buyer is in America or not.

There is no need to use silicone to fix the module. The bottom layer is a full ground plane allowing soldering it to the chassis. You can also screw it using the three holes (also grounded for soldering if needed).
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FM-DW and AM Saver modules for tube radios are here !
Tune using the dial, listen using the tubes !
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Old 4th Mar 2022, 5:16 am   #131
FStephenMasek
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Default Re: My FM converter for tube radios using the dial and tube amplifier

Here is the Espey2143(late) playing with the converter installed to replace the pre-WWII FM band
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Old 4th Mar 2022, 2:28 pm   #132
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Default Re: My FM converter for tube radios using the dial and tube amplifier

Just wanted to add my thanks to David for providing these modules. I have bought a pack of 4 so far, and used a couple on customer sets to great satisfaction.

Keep making them David - they will become more popular as time goes on!
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Old 7th Mar 2022, 6:27 pm   #133
agardiner
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Default Re: My FM converter for tube radios using the dial and tube amplifier

David - can you please provide some quick advice on fitting one of your units to a vintage transistor set. Most of these are germanium transistor, and have a positive ground.

Would I be correct in assuming that your module would need to be isolated from the chassis, with ground being connected to the -ve of the battery? The tuning cap would also need re-wiring and to be isolated from the chassis? Would the audio still work fine feeding to the volume pot via a cap?

Thanks and regards,

Adrian.
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