Shuggie's SL-1210 Blog Revived

[Ammonite Audio]

Hi Shuggs,

Does it absolutely *have* to be those dates?

I thought perhaps it might be a better idea to propose a few different dates, some maybe a little further ahead than August, and thrash out a mutually suitable one amongst those who had intended to come... Would that be possible instead?

Marco.

OK - I have looked at the calendar. Preferred dates are still in August, as this establishment is closed for the Summer stand-down and I therefore have much greater freedom to organise something without impinging on other activities going on here.

So, I can do the following dates:

Sat 22 August or Sun 23 August
Sun 30 August

If that's all too difficult because of holidays etc, then I propose:

Saturday 12 September or
Sunday 13 September

This would be a tad more involved because of the security arrangements. Nothing insurmountable, though.

Please can anyone wishing to come along indicate their preference(s), and then I'll post a dedicated bake-off thread for Marco to stick in place.

Cheers

Shuggie

[Magna Audio]

Only just caught up on this one. I'd love to come along and hear these top modded SL-1210's etc.

I could also bring my SL-1210 with Parallel tracking air arm or with the arm on the PL-71 if desired



Or



All dates fine with me.

[Marco]

Hahaha... You're a mad boy, Steve - no-one else would be so cheeky as to put a Terminator on a PL-71!

I could also bring my SL-1210 with Parallel tracking air arm or with the arm on the PL-71 if desired...

"If desired"? Too bloody right it's desired! I'd love to know how the Techy sounds, thus 'frocked'

Marco.

[NRG]

I'm intrested, September dates are better for me...

[DaveK]

I'd love to know how the Techy sounds, thus 'frocked'

Marco.

Hi Marco,
What is it with you - here you go again introducing the subject of ladies clothing into the discussion on the slightest of pretexts.
Cheers,

[Mike]

You should be used to it by now, Dave.

[DaveK]

You should be used to it by now, Dave.

Hi Mike,
I guess I should, but in my formative years, many many years ago, these things were only talked about behind closed doors and it still comes as a gentle shock to hear it not only talked about in public but to be actually flaunted. I noticed recently that he used the 'kissing' smilie a couple of times - very disconcerting at my age!!! I am not sure that I should ever accept sweets from him or, worse still, a lift in his car, were either ever to be offered.
Cheers,

[Marco]

Hahahahahahahaha.... What are you guys like?

Jeez, you should hear the conversations Ian Walker and I (and other friends I know well) have sometimes - this shit here is major lower league!



Marco.

[DaveK]

Hahahahahahahaha.... What are you guys like?

Jeez, you should hear the conversations Ian Walker and I (and other friends I know well) have sometimes - this shit here is major lower league!



Marco.

And this is supposed to reassure a confused old man??? - I'm getting more and more discocerted
I think it's time for bed but I ain't going yet - I don't want nightmares.

[Paul Hynes]

Following posts on this thread, it has been brought to my attention that a certain person who makes power supplies for the Technics SL1200 has posted information on his website that is factually incorrect. This information is copied from his website below ;-

Note 30 June 2009: PSRR has been mentioned by some people, but it is the end result that tells all on our PSU, quite simply we measure noise on a HP400F voltmeter with a noise floor of 2.5uV, remember too that most equipment rejects power supply noise by at least 60dB. Theorising is OK, but measurements tell all! Another manufacturer of PSU's normally used for preamplifiers decided to have ago at us, and about how his PSU reacted to differing loads and how much feedback he used. Well we all know about the pitfalls of excessive feedback and a motor control has different requirements to a preamplifier! The last we heard of it was that " is back with **** for the moment for some adjustments" yes indeed! We are professional designers with a long pedigree.

Now lets examine these comments.

1] “ another manufacturer of PSU’s normally used for preamplifiers decided to have a go at us”. Hmm, I don’t think so. If I decided to enter your market area, with serious intention, you would know about it by now. If someone asks me for a power supply for a specific function I will provide this whether it encroaches on your market or not. The power supply in question has been used for a wide variety of power supply applications since 1984 and is not just suitable for preamplifiers. In fact I was using this regulator topology in it’s early incarnation to power the Pink Triangle DC motor version of their record deck in the 1980’s very successfully. It has also been used for powering the origin live DC motor many times and every one has been very pleased with the resulting sound quality improvement.

2], “about how it reacts to differing loads”. It reacts a lot less than an LM317 to differing loads over a much wider bandwidth.

3], “about how much feedback he used”. Actually I don’t recall mentioning how much feedback I use in this circuit topology. For the record it is 20 dB less than the LM317 below 1 KHz but crucially it has a much wider open loop bandwidth than the LM317 with much better transient response than the LM317, which gives better control above 1KHz than the LM317 can achieve. It is also way quieter than the LM317. The voltage reference I use is a low noise device, which is well filtered, and the error amplifier device noise specification is 0.5 nanovolts root Hz with an LF noise corner of 1 Hz. This is a damn quiet power supply and it is very stable.

4], “Well we all know about the pitfalls of excessive feedback”. With this I do agree. You have to know what you are doing when you design wide bandwidth circuits. I test my designs on a 250 MHz scope with a wide variety of loads to ensure that the design is unconditionally stable and therefore suitable for any load.

5], “Motor control has different requirements to a preamplifier” I would be pleased if you would explain these different requirements.

6], “The last we heard of it was that “is back with **** for the moment for some adjustments”. Actually it was returned to me for checking as Hugo was getting strange voltage readings on his multimeter. On receiving the power supply I put it through a rigorous test procedure to see if I could reproduce the readings that Hugo was getting. The power supply was fine and was operating correctly for a whole week of soak testing and the general abuse I subject my power supplies to under test. Hugo then informed me that his multimeter was faulty and I sent the power supply back. He also mentioned this in his posts on this forum yet you have still suggested the power supply was faulty on your website. This is clearly untrue and very unprofessional.

7], “Yes indeed! We are professional designers with a long pedigree”. I cannot comment on this statement, as I do not know you. However I do question the professional integrity of the statements you have made about my power supplies on your website as they are erroneous.

Perhaps you would show me that you are capable of acting professionally by removing the erroneous comments from your website.

To the site moderators.
I am sorry to have to bring this issue to this forum thread but I feel that having been the subject of the above issues, that are related to posts on this thread, I have a right of reply.

Paul Hynes.