开云体育

ctrl + shift + ? for shortcuts
© 2025 Groups.io
  1. DahlquistSpeakers
  2. Messages
Expanded Topics Messages Polls
Date
Re: DQ10 Tweeter Fuse?

 

It has not been changed
Re: DQ10 Tweeter Fuse?

 

It is not the nonlinearity of the fuse per se but the unpredictability of the fuse holder that is the largest part of this issue.
I have measured this using the differential input on a TEK scope between the fuse body and the fuse clip.
I have also measured some nonlinearity on fuses that have been almost blown, that is visibly degraded but still having continuity. The voltage drop across the fuse was visibility distorted but not of a huge amplitude. 10’s of mV vs volts of drive signal.
Re: DQ10 Tweeter Fuse?

 

Joseph, also an EE here. And also a ham. I bet you're a patent attorney with than background.

Anyway, for the non-EEs, if you overdrive your speaker, something will give. A resistor, a driver (especially tweeter), or the surround on your woofer. Calling fuses a non-linearity when it is just a special piece of wire that melts easily is a minor issue at best, given all of the other non-linear components in your crossover. Let the fuse give up its life to protect the expensive components. When I buy used vintage equipment, my philosophy is the the more fuses the better. My amp has four panel mounted fuse holders on the back and a few on each channel's PC board.

While it was easier to deal with fuses blowing when there was a Radio Shack everywhere, I just stock up from Digi-Key or wherever you like. If I blow a fuse once a year it is a lot (except with home brew). I'll just add that in general all audio equipment fuses should be the regular (fast blow) type, except the AC line current ones which are often slow-blow due to power supply in-rush current.



-----Original Message-----
From: John Joseph McVeigh <kd4vs@...>
To: DahlquistSpeakers@groups.io
Sent: Thu, Mar 2, 2023 3:30 pm
Subject: Re: [DahlquistSpeakers] DQ10 Tweeter Fuse?

On Thu, 02 Mar 2023 11:33:40 -0800, Ed Marrs wrote:

> I believe there is a argument for removing the fuse and holder.? I
> just cannot remember the reason.

I have read claims by some people that fuses are nonlinear devices and
that, for that reason, a fuse will add distortion to the electrical
current delivered to the voice coil of the tweeter.

Color me extremely skeptical with respect to such claims.

I highly doubt that Jon Dahlquist would have used them if they
adversely affected the tonal quality of the sounds that the speakers
reproduce.

Moreover, as one with a degree in Electrical Engineering and one who
has done some pertinent measurements, I can assure you that the degree
of nonlinearity is, at most, infinitesimal.

As I recall, my DQ-10s were equipped at the factory with 0.8-Ampère
Fast-Blow AGC glass fuses.? Replacement fuses rated at 0.8 Ampères may
be a little difficult to find in brick-and-mortar stores, including
auto-parts stores.? I use 0.75-Ampère (? Ampère) fuses as replacements
for the factory-supplied originals.

John Joseph McVeigh, Attorney at Law
16230 Falls Road, P.O. Box 128
Butler, Maryland? 21023-0128

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Practice before the Federal Communications Commission
Member NY, DC, and USPTO Bars

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Re: DQ10 Tweeter Fuse?

 

I can't believe no one has pointed out yet, that the inline device in the photo is not a fuse holder. It's a bullet-style inline quick disconnect.

I'm in agreement with others that neither tweeter, nor the wiring, nor the motor board looks original/correct.

-Greg

On 2023-03-02 10:11, Roy Reed wrote:
I am the original owner DQ 10s purchased through audio club while
stationed in Europe in 1976-77. No serial numbers anywhere. All
original; nothing replaced so far. Has the AGC 3 fuse but does not
have the tweeter fuse where one would normally find it next to the
tweeter in a fuse holder. Instead, it has what looks to be an inline
fuse (see pic)?
The speakers came factory mirrored with a paper on which was right and
left but no right or left marking on the speakers. I can only guess
maybe these were an earlier pair as factory mirroring started given
lack of serial number or the usual tweeter fuse location.
My plan is to have the crossovers tested; local vintage audio repair
service believes it likely only the blue caps need replacing.
Speakers seem fine; woofer has been re-foamed.
My question would be whether to have a fuse/fuse holder mounted next
to the tweeter or leave well enough alone.
Links:
------
[1] /g/DahlquistSpeakers/message/6376
[2] /mt/97340583/5266916
[3] /g/DahlquistSpeakers/post
[4] /g/DahlquistSpeakers/editsub/5266916
[5] /g/DahlquistSpeakers/leave/9217918/5266916/519635072/xyzzy
Re: DQ10 Tweeter Fuse?

 

On Thu, 02 Mar 2023 11:33:40 -0800, Ed Marrs wrote:

I believe there is a argument for removing the fuse and holder. I
just cannot remember the reason.
I have read claims by some people that fuses are nonlinear devices and
that, for that reason, a fuse will add distortion to the electrical
current delivered to the voice coil of the tweeter.

Color me extremely skeptical with respect to such claims.

I highly doubt that Jon Dahlquist would have used them if they
adversely affected the tonal quality of the sounds that the speakers
reproduce.

Moreover, as one with a degree in Electrical Engineering and one who
has done some pertinent measurements, I can assure you that the degree
of nonlinearity is, at most, infinitesimal.

As I recall, my DQ-10s were equipped at the factory with 0.8-Ampère
Fast-Blow AGC glass fuses. Replacement fuses rated at 0.8 Ampères may
be a little difficult to find in brick-and-mortar stores, including
auto-parts stores. I use 0.75-Ampère (? Ampère) fuses as replacements
for the factory-supplied originals.

John Joseph McVeigh, Attorney at Law
16230 Falls Road, P.O. Box 128
Butler, Maryland 21023-0128

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Practice before the Federal Communications Commission
Member NY, DC, and USPTO Bars

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Re: DQ10 Tweeter Fuse?

 

The tweeter has a bucking magnet on the back and does not look like an original tweeter. The baffle board also does not look original. That having been said fuses, connectors like the red one, or even level controls in general are bad, and have the potential to be degrade the sound, particularly when they’re this old. This is due to unpredictable and intermittent contact resistance. As long as you do not listen super loud, the fuses have no good reason for being there, and I would suggest bypassing them. It would also be a good idea to check out the tweeter level control to make sure that the output adjusts smoothly and continuously.
Re: DQ10 Tweeter Fuse?

 

Sorry, I just realized that that is picture of the tweeter. ?Still very different from mine. ?Has the tweeter been changed?
Re: DQ10 Tweeter Fuse?

 

I believe there is a argument for removing the fuse and holder. ?I just cannot remember the reason. ?That mid-range speaker doesn’t look anything like the mid-range on my two pairs of DQ-10s. ?All speaker leads are directly solder on mine, with no crimped spade disconnects. ?
DQ10 Tweeter Fuse?

 

I am the original owner DQ 10s purchased through audio club while stationed in Europe in 1976-77.? No serial numbers anywhere.? All original; nothing replaced so far.? Has the AGC 3 fuse but does not have the tweeter fuse where one would normally find it next to the tweeter in a fuse holder.? Instead, it has what looks to be an inline fuse (see pic)?

The speakers came factory mirrored with a paper on which was right and left but no right or left marking on the speakers. I can only guess maybe these were an earlier pair as factory mirroring started given lack of serial number or the usual tweeter fuse location.??

My plan is to have the crossovers tested; local vintage audio repair service believes it likely only the blue caps need replacing.? Speakers seem fine; woofer has been re-foamed.?

My question would be whether to have a fuse/fuse holder mounted next to the tweeter or leave well enough alone.??

Fuse.jpg

Lp1

 

I’m looking for a working Lp1 and a dq1 for a friend looking to fulfill the whole dq10 system . He had mx1 and one dq1. It’s just not the same as active xo !!!

Thx
Richard?
Re: DQ-20i replacement tweeter?

 

开云体育



Bill Meyerhoff?

On Feb 16, 2023, at 12:55, Bill Meyerhoff <bmeyerhoff@...> wrote:

image
These are my new revision!
?

DQ20i


IMG_0348.jpeg


Bill Meyerhoff?

On Feb 15, 2023, at 22:02, rbelcke@... via groups.io <rbelcke@...> wrote:

?
I have used this speaker in two DQ-20 rebuilds. It looks, fits, and sounds like the origonal. It is still available form??






Rich


On Wednesday, February 15, 2023 at 08:40:13 PM CST, Bill Meyerhoff <bmeyerhoff@...> wrote:


Try Solen in Canada and Madisound and even Parts express. I may be getting the new type. That have specs more like the original tweeters.


Dahlquest Dahlquestimage0.jpeg


image1.jpeg

Bill Meyerhoff?

On Feb 15, 2023, at 14:41, Russ <russwarnock@...> wrote:

?I found the D2008 851200 for sale in the US, but I only see the 852100 overseas.? I'm wondering if I should actually look for the new one, or just buy the discounted 851200.??

I'm also curious how you found the data to know what the replacements are.? Thank you for the help!
<image1.jpeg>
<image0.jpeg>
Re: DQ-20i replacement tweeter?

 

开云体育

DQ20i


IMG_0348


Bill Meyerhoff?

On Feb 15, 2023, at 22:02, rbelcke@... via groups.io <rbelcke@...> wrote:

?
I have used this speaker in two DQ-20 rebuilds. It looks, fits, and sounds like the origonal. It is still available form??






Rich


On Wednesday, February 15, 2023 at 08:40:13 PM CST, Bill Meyerhoff <bmeyerhoff@...> wrote:


Try Solen in Canada and Madisound and even Parts express. I may be getting the new type. That have specs more like the original tweeters.


Dahlquest Dahlquestimage0.jpeg


image1.jpeg

Bill Meyerhoff?

On Feb 15, 2023, at 14:41, Russ <russwarnock@...> wrote:

?I found the D2008 851200 for sale in the US, but I only see the 852100 overseas.? I'm wondering if I should actually look for the new one, or just buy the discounted 851200.??

I'm also curious how you found the data to know what the replacements are.? Thank you for the help!
<image1.jpeg>
<image0.jpeg>
Re: DQ-20i replacement tweeter?

 

I’ve really enjoyed my DQ-20s using the Danish Hiquphon OWII. Direct replacement and an upgrade from the Scanspeak.?
Re: DQ-20i replacement tweeter?

 

I have used this speaker in two DQ-20 rebuilds. It looks, fits, and sounds like the origonal. It is still available form??






Rich


On Wednesday, February 15, 2023 at 08:40:13 PM CST, Bill Meyerhoff <bmeyerhoff@...> wrote:


Try Solen in Canada and Madisound and even Parts express. I may be getting the new type. That have specs more like the original tweeters.


Dahlquest Dahlquestimage0.jpeg


image1.jpeg

Bill Meyerhoff?

On Feb 15, 2023, at 14:41, Russ <russwarnock@...> wrote:

?I found the D2008 851200 for sale in the US, but I only see the 852100 overseas.? I'm wondering if I should actually look for the new one, or just buy the discounted 851200.??

I'm also curious how you found the data to know what the replacements are.? Thank you for the help!

Re: DQ-20i replacement tweeter?

 

开云体育

Try Solen in Canada and Madisound and even Parts express. I may be getting the new type. That have specs more like the original tweeters.


Dahlquest Dahlquestimage0.jpeg


image1.jpeg

Bill Meyerhoff?

On Feb 15, 2023, at 14:41, Russ <russwarnock@...> wrote:

?I found the D2008 851200 for sale in the US, but I only see the 852100 overseas.? I'm wondering if I should actually look for the new one, or just buy the discounted 851200.??

I'm also curious how you found the data to know what the replacements are.? Thank you for the help!

Re: DQ-20i replacement tweeter?

 

I found the D2008 851200 for sale in the US, but I only see the 852100 overseas.? I'm wondering if I should actually look for the new one, or just buy the discounted 851200.??

I'm also curious how you found the data to know what the replacements are.? Thank you for the help!
Re: DQ-20i replacement tweeter?

 

开云体育

Here’s the replacement?




Bill Meyerhoff?

On Feb 14, 2023, at 17:35, Bill Meyerhoff <bmeyerhoff@...> wrote:

?Scan-speak says they’re discontinued?


Bill Meyerhoff?

On Feb 14, 2023, at 15:54, Bill Meyerhoff <bmeyerhoff@...> wrote:

?

Type D2008/851200

Serial No.: 897

-66

PW.: 442017


They are SCAN-SPEAK’s replacement with ferro fluid cooling.

Re: DQ-20i replacement tweeter?

 

开云体育

Scan-speak says they’re discontinued?


Bill Meyerhoff?

On Feb 14, 2023, at 15:54, Bill Meyerhoff <bmeyerhoff@...> wrote:

?

Type D2008/851200

Serial No.: 897

-66

PW.: 442017


They are SCAN-SPEAK’s replacement with ferro fluid cooling.

Re: DQ-20i replacement tweeter?

 

Type D2008/851200

Serial No.: 897

-66

PW.: 442017


They are SCAN-SPEAK’s replacement with ferro fluid cooling.

DQ-20i replacement tweeter?

 

Just picked up a pair of dq-20i's and of course one tweeter is bad.? I can't find much info on the d2008 8517.? Anyone have any experience with these?? Also, is there a preferred supplier for foam for the woofers???

461 - 480 of 6831