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-   -   Losing air at bass drone (http://forums.bobdunsire.com/forums/showthread.php?t=167694)

Keith H 01-16-2019 09:12 AM

Losing air at bass drone
 
Looking for some expertise, thanks in advance. Was struggling with keeping the air pressure in the bag so did as test.
Blocked chanter - blew till drones stopped - got about 39 secs (damn) - drones came back
Plugged Base drone - blew till drones tennor stopped - got 2.30 to 3.21 - nice
Plugged tennor drones - blew till base drone stopped - got 0.39 - to me the problem drone.
Rehemped base drone and reed also making sure the reed tongue was not to open. Repeat test roughly same results. Tried different base reed, same results.
Can see no obvious damage to stock seat or reed seat.
Question what have I missed?
Again thanks

Jim Fogelman 01-16-2019 11:00 AM

Re: Losing Air at base drone
 
What make of bass reed(s)?

Are you sure itís optimized for air efficiency?

Where did you plug the bass drone from? Just at the stock or somewhere along the drone?

el gaitero 01-16-2019 11:33 AM

Re: Losing air at bass drone
 
Check the seal of the bass Bush...or edges around the cap...not leaking?

will103 01-16-2019 01:04 PM

Re: Losing air at bass drone
 
Hi Keith, I had the same problem. I found this useful:

https://www.youtube.com/watch?v=Mc4ACA1WYcg

Ta will

Keith H 01-16-2019 03:52 PM

Re: Losing Air at base drone
 
Quote:

Originally Posted by Jim Fogelman (Post 1334181)
What make of bass reed(s)?

Are you sure itís optimized for air efficiency?

Where did you plug the bass drone from? Just at the stock or somewhere along the drone?




Hi Jim, plugged at the top of the drone. The same as tapping it off but allows for longer testing. Actually, it was great until yesterday when this started.


Highland Reeds Balanced Tone also same results with Ezeedrone base reed.

Keith H 01-16-2019 03:53 PM

Re: Losing air at bass drone
 
Quote:

Originally Posted by el gaitero (Post 1334182)
Check the seal of the bass Bush...or edges around the cap...not leaking?


Corked all stocks (except blow stick) and the air holds well

Keith H 01-16-2019 03:54 PM

Re: Losing air at bass drone
 
Quote:

Originally Posted by will103 (Post 1334183)
Hi Keith, I had the same problem. I found this useful:

https://www.youtube.com/watch?v=Mc4ACA1WYcg

Ta will


Heading there now to have a look....Yep it's Bruces fault...it's a good video and the method I use to do a quick check ;)

DapperDan 01-17-2019 03:58 PM

Re: Losing air at bass drone
 
Is the tongue on the bass reed airtight? I mean if you mouth-blow the reed until it shuts, does air still get through? I had this issue recently and retired a set of reeds because of it.
From what I understand this used to be a standard test for cane reeds, and I would think applies to synthetics, though I don't hear about it much.

Edit: I believe Bruce Hitchings addresses this in the linked video, I watched it recently, so sorry to be redundant

el gaitero 01-17-2019 04:53 PM

Re: Losing air at bass drone
 
Quote:

Originally Posted by will103 (Post 1334183)
Hi Keith, I had the same problem. I found this useful:

https://www.youtube.com/watch?v=Mc4ACA1WYcg

Ta will

This is a very good vid Bruceís produced several year ago. Iím always intrigued by it ..because when I run the same test with EZ drone tenors I get ca 25 seconds....and the EZ reeds are set very very very efficiently and playing a 29-30Ē chanter reed.
Interestingly,I get 45 seconds on the bass alone..which is an MG Carbon.

I did try BT reeds a few years ago but did not at all care for the tone ( in my pipes) so immediately returned them to the retailer.

Keith H 01-17-2019 05:55 PM

Re: Losing air at bass drone
 
Quote:

Originally Posted by el gaitero (Post 1334214)
This is a very good vid Bruceís produced several year ago. Iím always intrigued by it ..because when I run the same test with EZ drone tenors I get ca 25 seconds....and the EZ reeds are set very very very efficiently and playing a 29-30Ē chanter reed.
Interestingly,I get 45 seconds on the bass alone..which is an MG Carbon.

I did try BT reeds a few years ago but did not at all care for the tone ( in my pipes) so immediately returned them to the retailer.


Well, I have managed to zero in on the reed and now am getting an avg of 1.20 following Bruce's test. So I'm happy now. Ended up opening the tongue the whole way and slowly bringing it back. Thanks


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