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D150 monster amp and funny tooobz
D150 monster amp and funny tooobz
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Old 16th November 2018, 08:17 PM   #1
koja is offline koja  Canada
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Default D150 monster amp and funny tooobz

This is what I expect when I finally wrap up recapping my ARC D-150:
http://www.audioresearch.com/Content...RC.D150web.pdf

Please feel free to use this thread for contributing both, anything funny and anything D-150 amp related. I will also post pics about my refurb of the unit. Thanks.
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File Type: gif tube_effect.gif (65.6 KB, 1539 views)

Last edited by koja; 22nd November 2018 at 03:21 PM.
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Old 16th November 2018, 08:30 PM   #2
Lingwendil is offline Lingwendil  United States
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When I fire up a first build and put on a really good track this is how I feel-

Click the image to open in full size.

Usually with my girl in the background yelling "babe turn it down the bass is hurting my chest!
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Old 16th November 2018, 08:35 PM   #3
rayma is offline rayma  United States
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Quote:
Originally Posted by koja View Post
This is what I expect when I finally wrap up recapping my AR D-150:
If you haven't already, removing the input coupling capacitor, and reducing
the value of the input hf filter capacitor to around 39pF, will make a big
difference as well.

Last edited by rayma; 16th November 2018 at 09:00 PM.
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Old 17th November 2018, 01:35 AM   #4
spaceistheplace is offline spaceistheplace
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Had the D75A for years and loved it.

The D150 is 150w per side?!
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Old 17th November 2018, 01:42 AM   #5
rayma is offline rayma  United States
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Quote:
Originally Posted by spaceistheplace View Post
Had the D75A for years and loved it. The D150 is 150w per side?!
Yes, with four 6550 output tubes per channel, and a larger power supply.
Similar cross-coupled drive circuitry.
Audio Research D-150 - Manual - High Definition Amplifier - HiFi Engine

Last edited by rayma; 17th November 2018 at 01:53 AM.
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Old 17th November 2018, 11:58 AM   #6
koja is offline koja  Canada
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Default D150 refurb

I thought the thread was going to invite more funny contributions but instead there is interest in D-150. That is Ok. I already meant to show my effort to refurbish it so might as well put it here.

Long story short, in 2017 I got an amazing deal. A friend acquired a D150 in an auction. It came from the estate of a local audiophile. And I traded an Oscope I did not need for this baby.

The unit came in an unbelievable condition. Not a scratch. One could tell it was not used for a long time since the dust was all from the top and not from the bottom where it draws air.

Here is what I saw on the first opening. More to come.
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File Type: jpg D150_181958_r.jpg (268.3 KB, 1376 views)
File Type: jpg D150_201621_3_r.jpg (237.9 KB, 1428 views)
File Type: jpg D150_201250_r.jpg (242.6 KB, 1397 views)
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Old 17th November 2018, 01:58 PM   #7
koja is offline koja  Canada
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Quote:
Originally Posted by rayma View Post
...reducing
the value of the input hf filter capacitor to around 39pF, will make a big
difference as well.
Thanks! I will take baby steps with the mods though. first goal is stock version with only changed electrolytic caps, then we can finesse it from there on

mine will only be used to drive a top section (starting from lower mid) of a bi-amped speaker. So bass performance is not a concern right now. As for hf I imagine the mod effect may depend on the speaker's top end performance? I guess the transformers here are the ones that set the tone for spectral distribution.
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Old 17th November 2018, 02:53 PM   #8
nigelwright7557 is offline nigelwright7557  United Kingdom
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You dont need valves just a use a soft limiter,
I found this in wireless world in the 1980's.
You can the adjust amount of valve distortion.
softlimiter | harrabylad | Flickr
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Old 17th November 2018, 08:00 PM   #9
spaceistheplace is offline spaceistheplace
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To not detract from the OPs thread, could you please point me to a thread, discussion or commercial device using this soft limiter circuit?

Or perhaps the original wireless world article?
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Old 18th November 2018, 03:37 AM   #10
koja is offline koja  Canada
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that IS a different subject. I actually am a Pass guy and this tube amp wrecked my plans for my next system. I already built two BA-3b class A mono blocks for it, but the curiosity got better of me and I decided to try tubes in D150 for a while. So the refurb is under way; almost done actually (just got busy with other things).

On the subject of creating a distortion pattern that brings some "warmth" mainly to vocal reproduction you can check this:
H2

Last edited by koja; 18th November 2018 at 03:39 AM.
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