BMU Problem

All things NVA
Principia
Posts: 25
Joined: Fri Dec 02, 2016 9:45 am
Has thanked: 2 times
Been thanked: 2 times

BMU Problem

Unread post by Principia »

I have had my BMU for about 3 years now, however it has been out of use, stored away for the last 18 months. Now having the chance to bring it back into use I find that when plugging it in the fuse box trips out every time. Does it at any of the sockets in the house. Never did this previously, any ideas what the issue may be or do I have a nice unmarked perspex doorstop for the house now ?

Thanks in advance of any advice.
Cambridge Audio CXC, NVA SSP Digital, Primare DAC 30, NVA P90, Jadis CA30, NVA LS6, Quad 57's

User avatar
savvypaul
Posts: 8635
Joined: Tue Oct 11, 2016 7:14 pm
Location: Durham
Has thanked: 1657 times
Been thanked: 2978 times
Contact:
Great Britain

Re: BMU Problem

Unread post by savvypaul »

How many times have you tried plugging it in?

Is anything plugged into the BMU?
I am in the hi-fi trade
Status: Manufacturer
Company Name: NVA Hi-Fi
https://nvahifi.co.uk/

User avatar
Fretless
Posts: 9290
Joined: Wed Nov 12, 2014 12:15 pm
Location: Somewhere in Holland
Has thanked: 1487 times
Been thanked: 2280 times
Netherlands

Re: BMU Problem

Unread post by Fretless »

Damp in the wiring after storage?

Could try letting it dry out in a warm place for a day or 2.

Upstairs:
Vinyl
Pro-Ject 1.2 + Grado Sig Jr + Cambridge Alva Duo
DigiVolumio PC + Kiss DP-500 + Sabaj A20d
NVA: P50sa - Cube2 - SSP - LS6+ Sabaj A10a (x2)
Downstairs:
Vinyl
Logic DM101 + Syrinx LE1 + Grado Sig MCX
DigiDenafrips Ares II + Volumio PC + Cambridge CXC
NVA: P50 - BMU+ Aiyima A07 MAX (x2) + Arcam One
HP: HifiBerry Digi+ PRO + Sabaj A10d
Office:
Allo DigiOne SIG + SMSL M300se + Douk G4 (x2)
Mission 760 + Monolith THX AAA 887
Headphones: German Maestro, Monolith & AQ

Principia
Posts: 25
Joined: Fri Dec 02, 2016 9:45 am
Has thanked: 2 times
Been thanked: 2 times

Re: BMU Problem

Unread post by Principia »

savvypaul wrote: Mon Mar 08, 2021 5:45 pm How many times have you tried plugging it in?

Is anything plugged into the BMU?
Tried twice upstairs using the same socket it used to be in and another one , then a further one downstairs all with nothing plugged into it.
Cambridge Audio CXC, NVA SSP Digital, Primare DAC 30, NVA P90, Jadis CA30, NVA LS6, Quad 57's

Principia
Posts: 25
Joined: Fri Dec 02, 2016 9:45 am
Has thanked: 2 times
Been thanked: 2 times

Re: BMU Problem

Unread post by Principia »

Fretless wrote: Mon Mar 08, 2021 5:54 pm Damp in the wiring after storage?

Could try letting it dry out in a warm place for a day or 2.
Thanks for the thought but it has been in a bedroom all the storage time so hopefully no damp ingress
Cambridge Audio CXC, NVA SSP Digital, Primare DAC 30, NVA P90, Jadis CA30, NVA LS6, Quad 57's

User avatar
savvypaul
Posts: 8635
Joined: Tue Oct 11, 2016 7:14 pm
Location: Durham
Has thanked: 1657 times
Been thanked: 2978 times
Contact:
Great Britain

Re: BMU Problem

Unread post by savvypaul »

Principia wrote: Mon Mar 08, 2021 6:37 pm
savvypaul wrote: Mon Mar 08, 2021 5:45 pm How many times have you tried plugging it in?

Is anything plugged into the BMU?
Tried twice upstairs using the same socket it used to be in and another one , then a further one downstairs all with nothing plugged into it.
First, check that nothing has fallen into any of the sockets. You may need to use a torch.

Assuming all clear, then try it up to 4 times, in quick succession.

If it's still tripping after that then there is something wrong.

Are you in the same house that you were when you last used the BMU?
I am in the hi-fi trade
Status: Manufacturer
Company Name: NVA Hi-Fi
https://nvahifi.co.uk/

Principia
Posts: 25
Joined: Fri Dec 02, 2016 9:45 am
Has thanked: 2 times
Been thanked: 2 times

Re: BMU Problem

Unread post by Principia »

savvypaul wrote: Mon Mar 08, 2021 6:49 pm
Principia wrote: Mon Mar 08, 2021 6:37 pm
savvypaul wrote: Mon Mar 08, 2021 5:45 pm How many times have you tried plugging it in?

Is anything plugged into the BMU?
Tried twice upstairs using the same socket it used to be in and another one , then a further one downstairs all with nothing plugged into it.
First, check that nothing has fallen into any of the sockets. You may need to use a torch.

Assuming all clear, then try it up to 4 times, in quick succession.

If it's still tripping after that then there is something wrong.

Are you in the same house that you were when you last used the BMU?

Thanks Paul I'll give those suggestions a try, yes same house.
Cambridge Audio CXC, NVA SSP Digital, Primare DAC 30, NVA P90, Jadis CA30, NVA LS6, Quad 57's

User avatar
savvypaul
Posts: 8635
Joined: Tue Oct 11, 2016 7:14 pm
Location: Durham
Has thanked: 1657 times
Been thanked: 2978 times
Contact:
Great Britain

Re: BMU Problem

Unread post by savvypaul »

Principia wrote: Mon Mar 08, 2021 6:53 pm
savvypaul wrote: Mon Mar 08, 2021 6:49 pm
Principia wrote: Mon Mar 08, 2021 6:37 pm

Tried twice upstairs using the same socket it used to be in and another one , then a further one downstairs all with nothing plugged into it.
First, check that nothing has fallen into any of the sockets. You may need to use a torch.

Assuming all clear, then try it up to 4 times, in quick succession.

If it's still tripping after that then there is something wrong.

Are you in the same house that you were when you last used the BMU?

Thanks Paul I'll give those suggestions a try, yes same house.
OK.

BTW what is the maximum constant power consumption rating of your Jadis monoblocks? Did you ever use them with the BMU?
These users thanked the author savvypaul for the post:
Principia (Mon Mar 08, 2021 7:42 pm)
I am in the hi-fi trade
Status: Manufacturer
Company Name: NVA Hi-Fi
https://nvahifi.co.uk/

Principia
Posts: 25
Joined: Fri Dec 02, 2016 9:45 am
Has thanked: 2 times
Been thanked: 2 times

Re: BMU Problem

Unread post by Principia »

@ Savvypaul

Max power consumption 110V, yes used them before.

However, all immaterial as the 4 times re-try has worked a treat and all seems to be working now. :clap:

So firstly big thanks for the suggestions and secondly what is the mysterious power of 4 that fixes the BMU ?
These users thanked the author Principia for the post:
savvypaul (Mon Mar 08, 2021 7:32 pm)
Cambridge Audio CXC, NVA SSP Digital, Primare DAC 30, NVA P90, Jadis CA30, NVA LS6, Quad 57's

User avatar
savvypaul
Posts: 8635
Joined: Tue Oct 11, 2016 7:14 pm
Location: Durham
Has thanked: 1657 times
Been thanked: 2978 times
Contact:
Great Britain

Re: BMU Problem

Unread post by savvypaul »

Principia wrote: Mon Mar 08, 2021 7:30 pm @ Savvypaul

Max power consumption 110V, yes used them before.

However, all immaterial as the 4 times re-try has worked a treat and all seems to be working now. :clap:

So firstly big thanks for the suggestions and secondly what is the mysterious power of 4 that fixes the BMU ?
Just Tomasz's experience of building and testing them.

When first built, most would trip once and then be good. Very occasionally, one would need 3 or 4 attempts.
These users thanked the author savvypaul for the post (total 3):
Principia (Mon Mar 08, 2021 7:46 pm) • Andy-831 (Mon Mar 08, 2021 9:22 pm) • Bencat57 (Wed Mar 10, 2021 4:28 pm)
I am in the hi-fi trade
Status: Manufacturer
Company Name: NVA Hi-Fi
https://nvahifi.co.uk/

Post Reply