BeePre blowing fuses

dw · 5981

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Offline dw

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on: February 27, 2013, 05:07:42 AM
I didn't mention befire that I blew the fuse on my first power up. I looked at the assembly - seemed ok -
so I tried another fuse and it came up. Then listened to it for a few hours last night. This morning,
it powered up and I listened for about 15 minutes. Then powered down for two hours. Then I blew the fuse
again on powerup.

The parts list says its a 1A slo-blo GMA fuse. On the fuse it says F1AL 250V. When I look online, several places indicate
that the F is for fast blow and slow blow has a T. First, is this correct? Second, if so, am I masking a problem by using a slo-blow?
I'm guessing not. But, if the F1AL is a slow blow, then I have a problem.

The voltages follow. By the way, the sound at 70-80dB is, well, stunning.

pin  spec   mine
11  146      145.9
12     0          0
13     0          0
14     0          0
15  186       184
16      5          5.06
17  90-110   97.5
18     0         0
19   9.85      9.81

20     0         0
21     0         0
22  213     211.2
23     0         0
24     0         0
25  213     210.5
26     0         0
27     0         0
28     0         0
29    6.8     6.73

30    6.8     6.73
31  13.6    13.5
32     0          0
33     0          0
34  13.6    13.56
35    6.8      6.76
36    6.8      6.74
37     0          0
38     0          0
39     0          0
40   213      210
41      0         0
42      0         0
43   213      210
44      0         0
45      0         0
46   213     209.5
47     n/a
48      0         0
49      0         0
50    n/a
51      0         0

A1   risky
A2      0         0
A3  90-110   95
A4   risky

B1  risky
B2      0         0
B3 90-110    97
B4 risky

C1,D1  n/a
C2,D2    0        0,0
C3,D3 3.5-4.5  4.27, 4.48
C4,D4   n/a
C5,D5   n/a
C6,D6   n/a
C7,D7  147    146,146
C8,D8   n/a
C9,D9  147    146,146

Thanks!



Offline Doc B.

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Reply #1 on: February 27, 2013, 05:15:17 AM
Sounds like you did indeed get a fast blo. IIRC we have been sent the wrong fuse by our suppliers on occasion. A proper slo blo 1A should solve the problem.
« Last Edit: February 27, 2013, 05:31:19 AM by Doc B. »

Dan "Doc B." Schmalle
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Bottlehead Corp.


Offline Grainger49

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Reply #2 on: February 27, 2013, 05:18:34 AM
I am convinced that a dead startup, just after the build when the capacitors have never been charged, draws more current for a while.  By for a while I mean hours.  At least that was my experience with my Eros.  It was powered from a PS Audio P300.  The whole system went to 200W and stayed there for 2-3 hours then started to lower.  It has never reached 200W again.

Sorry I can't help you with the fuse question.  I'm just saying that a fast blow might be fine after the first few hours.

Good luck, keep us posted on your impressions!
« Last Edit: February 27, 2013, 05:40:45 AM by Grainger49 »



Offline pdxgrampa

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Reply #3 on: February 27, 2013, 05:20:26 AM
Dw:
I had the same problem same fuse type.
1Amp Slo Blo fixed it.

Greg
Music Hall 5.1SE,EROS. OPPO 980HD, Music Hall 25.3 Dac. BeePre/BeeQuiet. Paramount V1.1 300B,Orca Deluxe W/ Subs/SPA250s.Stereomour W/Orca Deluxe. Crack W/Speeball(2) .Beyerdynamic 990s.Crackheadphone.


Offline dw

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Reply #4 on: February 27, 2013, 05:30:32 AM
Thanks, everyone! I'll get the slow blow.

-Dave



Offline Doc B.

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Reply #5 on: February 27, 2013, 05:32:10 AM
Yeah sorry I meant a proper slo blo should fix it. Corrected my previous post.

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.


Offline dw

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Reply #6 on: February 27, 2013, 07:31:44 AM
The slow blow is in and everything is good.

-Dave



Offline Grainger49

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Reply #7 on: February 27, 2013, 09:36:59 AM
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fi244.photobucket.com%2Falbums%2Fgg7%2FGrainger49%2FSmiles%2Fwelldone.gif&hash=332f2549437c6c0b1e58c7565889dca0e76246e4)



Offline bjorgens

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Reply #8 on: March 06, 2013, 10:26:27 PM
Indeed looks like some fast blows got mixed in stock.  Had two of the same FTAL 250V pieces in my paramount kits.  Oddly, the first amp powered up no problem.  The second popped the fuse with all resistance checks in line.  Hoping the issue is in fact the fuse... :)

B

Bryan Jorgensen

VPI Traveler (Ortofon 2M Bronze)
Coffman Labs G1A preamp/phono/ headphone amp
Paramount 300B monoblocks
First Watt F4 clone
Blumenstein Orca Deluxe speakers and subwoofer
Cardas cabled Sennheiser 600s


Offline Grainger49

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Reply #9 on: March 07, 2013, 12:31:56 AM
This says that the fuses on Bottlehead equipment is well sized.  It will open quickly, hopefully protecting components downstream from any problem.