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Old 29th April 2006, 02:05 AM   #1
qazkq8v is offline qazkq8v  Canada
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Question ILP Amplifier Modules

There is a company out of the UK named ILP Electronics. It makes a range of power amp modules: basically the entire amp circuit is embedded in some vitreous material bonded to a heat sink. Most of the modules have 5 connections: ground, Vcc+, Vcc-, in, out; though some integrate the PSU less the transformer as well.

Has anyone used these? Are they any good?
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Old 29th April 2006, 02:09 AM   #2
anatech is offline anatech  Canada
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Hi qazkq8v,
I am very familiar with the ones I sold in the late 70's and early 80's. There were what you describe.

They sounded good back then. They blew up easily if abused at all. They could be destroyed instantly from poor grounding when wiring them up. I built a stereo amp that worked well for years using a pair of HY120's (60W). The guy I sold it too blew it up. I don't think it took much.

-Chris
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Old 2nd May 2006, 01:36 PM   #3
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I built an ILP power amp in 1988. I don't recall the model number but I remeber the specification called for +/-40 to 57volts rails (or similar). I drove it with +/-60 and the two modules died within days of use. I don't think they were engineered for "good times". As I recall I purchased the 2 modules at Active components on Lombard Street and they were very expensive.

I thought I saw some recently in a surplus store, wasn't ILP connected to Plitron somehow or am I making that up?
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Old 2nd May 2006, 03:24 PM   #4
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I have some ILP brand toroidals, very nice transformers. Maybe that's the connection?
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Old 2nd May 2006, 07:48 PM   #5
cpemma is offline cpemma  United Kingdom
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http://www.ilpelectronics.com/

Blast from the past.

They did sell toroids (I have one from around 1980), now only made to order by the look of it.
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Old 9th May 2006, 09:11 PM   #6
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I used them for disco work in the seventies. !00% reliable.
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Old 10th May 2006, 11:39 AM   #7
latala is offline latala  United Kingdom
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i still have ilp 120 modules and they still work> Untill recently they were sold by RS components
Mine were from a local radio station and salvaged our of a skip!
Used correctly they are 100% reliable
refards Trev
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Old 12th February 2017, 06:46 PM   #8
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Back in the 80's I assembled a Stereo Amp with 2 ILP MOS 248 modues + the HY 66 Pre Amp. It did not sound too good. I had in storage for last 25 Years. Recently connected it and was surprised it is still working. Probably the HY 66 Preamp with Tone control was the problem, I am now trying to revive it with a new Preamp from ebay that uses LM1036 +NE5532. Will let you know how that works out. If results are any good I will post pictures. HY248 / MOS248 specs: 120W into 8 Ohms <0.015% THD at 30W @1khz +/_ 45V @2.5Amp Input Sensitivity: 500mV RMS
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Old 12th February 2017, 09:45 PM   #9
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I’m still using one ILP module as monoblock amplifier (bought it in 1993). More specific the SMOS 128, it sounds ok, no hiss at all.
I’ll post some pictures here or in “Chip Amp Photo Gallery”.

Attached are the product specs.


Quote:
Originally Posted by djmaratt View Post
Back in the 80's I assembled a Stereo Amp with 2 ILP MOS 248 modues + the HY 66 Pre Amp. It did not sound too good. I had in storage for last 25 Years. Recently connected it and was surprised it is still working. Probably the HY 66 Preamp with Tone control was the problem, I am now trying to revive it with a new Preamp from ebay that uses LM1036 +NE5532. Will let you know how that works out. If results are any good I will post pictures. HY248 / MOS248 specs: 120W into 8 Ohms <0.015% THD at 30W @1khz +/_ 45V @2.5Amp Input Sensitivity: 500mV RMS
Attached Images
File Type: jpg ILP_SMOS128.jpg (584.0 KB, 276 views)
File Type: jpg ILP_SMOS128_data.jpg (784.4 KB, 272 views)
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Old 12th February 2017, 11:20 PM   #10
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Here is my update.
I disconnected the HY66 preamp.
Then connected the signal from an external USB 5.1 Channel Sound Card Adapter to the new Preamplifier with LM1036 + NE5532. (This arrangement works well with the Heathkit-DAYSTORM Model AA100 Tube Amplifier), but this was not good for the ILP MOS 248 Module. It was distorting too much.
So I removed the Preamplifier and fed audio the signal directly from the external USB sound card to the ILP MOS 248 input. This produced very clean audio output -there was no hiss or hum. There is no listening fatigue.

Bottom line I did not need any pre-amplifier! I will look into adding a tone control using LM1036.

I am uploading the pictures.
Attached Images
File Type: jpg 20170212_180926.jpg (803.8 KB, 263 views)
File Type: jpg 20170212_180753.jpg (739.1 KB, 251 views)
File Type: jpg 20170212_181132.jpg (357.7 KB, 241 views)
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