I've just finished fitting TTS sound into this Bachmann class 37 using an iPhone speaker. Not only does this speaker fit better than the standard one but it also sounds far better as well! The speaker is very easy to fit because it goes straight into the space provided, no need to remove the fan.
You can find it on our website here: [ Ссылка ]
Or here if you prefer to use ebay: [ Ссылка ]
This speaker isn't just useful for class 37's but pretty much all other models when using Hornby TTS decoders.
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