7mm The Derby Line - Rolling Stock

[Cliff Williams]

Shameless gratuitous plug - I have my 35mm round, 15mm deep 8 ohm 3 watt speaker which I will be trying in smokeboxes very soon. It packs a hefty punch when I modify Masterpiece Models Stars/Saints/4-4-2s tenders with it, so it should do a good job in the larger smokebox. No good for resin boilered locos of course!

 

[Steph Dale]

Cliff,
Is it the same as the one from Tony's or QSI? If so I think you'll find it works very well! I'll be interested to see how your smokebox fit works, I tend to go for the rear tubeplate so the sound comes out through the firebox and exits under the chassis. This gives really good acoustic coupling and allows much of the boiler tube to act as the resonance chamber; clean, dynamic response.
In my experience the so-called 'high bass' speakers' great advantage is that they're not as susceptible to a small resonance chamber; this might be an advantage with a smokebox fit.
I hope you're not looking to get sound out of chimney, that really doesn't work as it effectively turns the speaker in to a horn-driver; the chimney area is small so it'll act as a high-pass filter and also be highly directional.
I'll be very interested to see how you fit the speaker and know how well it works.
Steph

 

[Cliff Williams]

The QSI one HB122R is 31mm round and has 2 watts of power - I have used them and they are good for the smaller smokebox - this one is my own brand CJW at 35mm and 3 watts so does the trick if the space can take it.

 

[Steph Dale]

Cliff,
Thanks for the clarification. That sounds like a useful size so I'll be interested to see how it fits
Cheers,
Steph

 

[Cliff Williams]

Steph we are on the same page regarding the smokebox shapes and holes.
I have had a few Korean built locos through my workshop with small mylar speakers up front and no sound coming out, open the smokebox doors and it improves, but the mechanism and track noise drowns it out. The ideal combination is a large tender speaker and as big a one in the loco.
There is a downside to this though as some of my customers need their locos packed with weight to haul trains, so its either a speaker or weight fighting for space!
Best scenario is a good speaker in the tender which does not need to be driven with a high CV63 value in order to get the sound strong enough to do the job!

 

[dibateg]

Feel free to post a pic of the speaker Cliff - I guess it probably looks like... a speaker, but would be interested in any case!

 

[dibateg]

So I'm buzzing along with these tenders now, the axleboxes and springs consist of several parts, so there is a days work in cutting off sprue, cleaning up and fitting 16 of them. I soldered them all in place with 145 degree solder.

 

[Cliff Williams]

Thanks Tony - this is the new CJW Speaker 35mm round 15mm deep, 8 ohm 3 watt.
It is sitting inside a brass enclosure I put together for a Heljan Class 31, sounds good and gives a chunk of bass.
Apologies for slowness of the reply, there has been no home phone or broadband for 7 weeks now - useless BT!

 

[dibateg]

The frames are progressing well. I had a little difficulty with the hornguides, until I worked out I force the fold further out by using the edge of a ruler to control the bend. The majority of the bearings then just dropped in without any fettling. The half etch tab is on the outside of the fold.


The frames - with one inverted. Brake fitting next.

 

[dibateg]

I apologise for my indulgence, I have many friends on here and building trains is what makes us tick. In the background are our loves, families and pets. Yesterday one of our cats, the dear, affectionate, chatty, fluffy Poppy was knocked down in the lane and killed. I have never known such grief, Les and I are broken hearted. Her sister sits on the patio waiting for her to come back.
I'm sure those that have pets and love them will understand.

 

[Heather Kay]

Understood perfectly. Pets become part of the family, and are missed as much as any human relative. It's worse when it's sudden, but still a wrench when it's due to illness.

 

[Dan Randall]

So sorry to hear that Tony - my thoughts are with you both at this sad time. RIP Poppy.


Dan

 

[SteadyRed]

Having recently lost one of our greyhounds suddenly & unexpectedly we fully understand your grief. To loose any pet is bad, but when it is unexpected even more difficult.

Dave

 

[Len Cattley]

Hi Tony sorry to hear your loss, we know what it's like losing pets. R.I.P. Poppy.

Len

 

[3 LINK]

Hi Tony,

So sad to hear of your loss, like others have said when it is so sudden it just makes it that much harder to come to terms with it.

My wife and I have lost a few dear furry companions throughout the years, and our thoughts are with you and Les.

R.I.P. Poppy.

Martyn.

 

[lancer1027]

Sorry to hear your bad news Tony. As a pet lover myself i fully understand your grief and our thoughts are with you.

Rob

 

[Wagonman]

Really saddened by your loss. She looks a real sweetie.


Richard

 

[Compton castle]

Sorry to hear the bad news, we lost our dog last year even though he was old it was quite sudden. The house still feels empty with out him around

 

[OzzyO]

Know what yous are going through, we lost this fellow two weeks ago, after 16 year.


Misty at the workshop door,


OzzyO.

 

[dibateg]

Thank you all for your kind words of comfort, they do help with this terrible grief.