What is an HMV Record Groove Indicator (In Pocket Case) ?

[poodling around]

I was looking at a 1939 HMV booklet and saw this advertised - and I can't think what it could be.

What is it I wonder ?

HMV Record Groove Indicator (In Pocket Case):

[52089]

Here's an example, courtesy of Google

https://www.worthpoint.com/worthopedia/ ... -288424739

[Curt A]

In case that disappears:

[poodling around]

Here's an example, courtesy of Google

https://www.worthpoint.com/worthopedia/ ... -288424739

Aha ! Very interesting indeed !

Thank you very much 52089.

[Roaring20s]

Building on the above...

James.

[poodling around]

Building on the above...

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James.

Very good - although this reminds me a bit of my school days and using what was called a 'slide rule' during Mathematics lessons. I think trying to use this HMV accessory would confuse me just as much

[Orchorsol]

Some of us still use the HMV DB 4037 gliding tone test record, and other discs in that series, when tuning soundboxes! One side of the scale is specifically for that record.

[poodling around]

Some of us still use the HMV DB 4037 gliding tone test record, and other discs in that series, when tuning soundboxes! One side of the scale is specifically for that record.

Very interesting indeed.

I would watch a video of this taking place if there are any.

Thanks Orchorsol.

[Orchorsol]

Some of us still use the HMV DB 4037 gliding tone test record, and other discs in that series, when tuning soundboxes! One side of the scale is specifically for that record.

Very interesting indeed.

I would watch a video of this taking place if there are any.

Thanks Orchorsol.

There's nothing scientific or specific about using it - just subjectively listening for any peaks and troughs in the response, along with listening to various familiar records of music. I can certainly upload the gliding tone record to YouTube though, if you'd still like to hear it!

[soundgen]

Some of us still use the HMV DB 4037 gliding tone test record, and other discs in that series, when tuning soundboxes! One side of the scale is specifically for that record.

Very interesting indeed.

I would watch a video of this taking place if there are any.

Thanks Orchorsol.

There's nothing scientific or specific about using it - just subjectively listening for any peaks and troughs in the response, along with listening to various familiar records of music. I can certainly upload the gliding tone record to YouTube though, if you'd still like to hear it!

go for it , it;s got to be better than finger tapping 1