Gyraf Pultec Style EQ Finished

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Gyraf Pultec Style EQ Finished

Postby waitup » Tue Aug 31, 2010 6:22 pm

Hey Turtlecrockers,

I just wrapped up this G Pultec project. For those who don't know about this one all the details are here: http://www.gyraf.dk/

I took the photo of the guts before I had installed the input transformer, but it now has transformer in and out. Trafos are some I got off rick, not sure what they are but they can be wired 2:1 or 1:1 so they were good for this. Tube is 50's NOS mullard off the bay, somewhere in the UK if I remember rightly. I was concerned that the massive power transformers I had lying around were going to make this bad boy hum because I physically couldn't get them far away from the audio boards, but it's quiet as a mouse! I've just used the small can style inductors, I might yet get a 'nice' inductor with multiple taps and try that out too.

I really like the sound of this one, I'll have to build another one soon so I can use it on drum bus, mix bus etc! If anyone in Aus. decides to build this one and is having trouble sourcing any parts give me a yell.

Pultec guts.jpg


pultec front 1.jpg


pultec front 2.jpg
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Re: Gyraf Pultec Style EQ Finished

Postby Alastair Reynolds » Tue Aug 31, 2010 8:57 pm

Nice Job Nick, there's something inherently satisfying about hand building a piece of equipment
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Re: Gyraf Pultec Style EQ Finished

Postby waitup » Tue Aug 31, 2010 9:44 pm

There certainly is, and it's the best when it fires up first time!
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Re: Gyraf Pultec Style EQ Finished

Postby mylesgm » Tue Aug 31, 2010 10:38 pm

These sound so sweet, I've got a pair and use them heaps...

Nice looking build too.

M
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Re: Gyraf Pultec Style EQ Finished

Postby waitup » Tue Aug 31, 2010 10:41 pm

mylesgm wrote:These sounds so sweet


Tell me about it!
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Re: Gyraf Pultec Style EQ Finished

Postby Alistair » Wed Sep 01, 2010 1:21 am

Looks great! Been considering this as a next build after I finish my pair of 1176's, so it's nice to see some finished and hear good feedback.

Really neat front panel too!
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Re: Gyraf Pultec Style EQ Finished

Postby Hybrid88 » Wed Sep 01, 2010 10:01 pm

Very Nice! Did you source all parts from Aus? What was the total cost if it isn't rude? Also, where did you get the PCB form? Might make one of these, perhaps - I like the idea of DIY rack gear.
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Re: Gyraf Pultec Style EQ Finished

Postby waitup » Wed Sep 01, 2010 11:07 pm

Hybrid88 wrote:Very Nice! Did you source all parts from Aus? What was the total cost if it isn't rude? Also, where did you get the PCB form? Might make one of these, perhaps - I like the idea of DIY rack gear.


Hi there,

Most of the parts came from australia, or suppliers that happily ship to Australia. Caps and resistors were from futurlec.com.au. Switches, case and connectors from Altronics and anything I missed I picked up from WES components. The tube came from a UK supplier I found on ebay. PCB's you can order directly from this guy, Gustav here: http://www.prodigy-pro.com/diy/index.php?topic=10776.0 Transformers are really up to you... you can go expensive or cheap. You need a 2:1 and a 1:1. You can use a multi-tapped wound inductor or individual can style inductors, which will vary the price a bit.

I reckon you could scrape one together for 250-300 bucks, but it might be worth spending an extra couple of hundred for nice transformers etc.

Give me a couple of days and I'll pull my info together and email it to you... send me a PM.

Nick.
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Re: Gyraf Pultec Style EQ Finished

Postby prequalizer » Thu Sep 02, 2010 8:24 am

Has anyone compared these to other pultecs?
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Re: Gyraf Pultec Style EQ Finished

Postby waitup » Thu Sep 02, 2010 10:23 am

Having used/been around Rick's Pultecs a fair bit I would say the Gyraf doesn't sound very much like a real one... but it still very sounds good!
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Re: Gyraf Pultec Style EQ Finished

Postby Chinagraf » Fri Sep 17, 2010 10:16 am

That's a beautifully named analog echo you have there.
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Re: Gyraf Pultec Style EQ Finished

Postby Chris H » Fri Sep 17, 2010 2:46 pm

Chinagraf wrote:That's a beautifully named analog echo you have there.


I thought it looked a bit dodgey myself.
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Re: Gyraf Pultec Style EQ Finished

Postby Chinagraf » Fri Sep 17, 2010 3:31 pm

Perhaps you would prefer this gear ...
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Re: Gyraf Pultec Style EQ Finished

Postby rick » Fri Sep 17, 2010 4:22 pm

wit
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Re: Gyraf Pultec Style EQ Finished

Postby waitup » Fri Sep 17, 2010 8:28 pm

Chinagraf wrote:That's a beautifully named analog echo you have there.


If you knew what it sounded like, maybe you wouldn't want your name on it!
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Re: Gyraf Pultec Style EQ Finished

Postby rick » Fri Sep 17, 2010 9:09 pm

witless
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Re: Gyraf Pultec Style EQ Finished

Postby Ben M » Fri Sep 17, 2010 9:28 pm

This says everything
I just want to pinch those big dreamy cheeks.
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Re: Gyraf Pultec Style EQ Finished

Postby waitup » Fri Sep 17, 2010 11:46 pm

you see, you think this is pretty funny guys, but being my age I've been likened to franklin the turtle by peers for as long as I can remember. What I want to know is what made rick think of it?!?!

P.S. Rick thanks for the email, there is a package on its way to mill rd as we speak.
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Re: Gyraf Pultec Style EQ Finished

Postby Ben M » Sat Sep 18, 2010 12:57 pm

I'd like to start this build but I'd like to use the grand master audio front panels. I think this means that the gyraf front panel pcbs want fit and I'd have to fly the cables from the pots to the pcb. Any words of wisdom before I order up? Who else is doing panels??
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Re: Gyraf Pultec Style EQ Finished

Postby waitup » Sat Sep 18, 2010 1:57 pm

I assume that parusha guy who got banned from the prodigy forum makes one... have you seen his site? it's something like diy-racked.com or something.

have you seen these ones? http://don-audio.com/Front-Panels
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Re: Gyraf Pultec Style EQ Finished

Postby Chris H » Sat Sep 18, 2010 2:37 pm

Chinagraf wrote:Perhaps you would prefer this gear ...



........Ah! The Hallam Rack........ I prefer the one I sleep with!
:ar!
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Re: Gyraf Pultec Style EQ Finished

Postby Ben M » Sat Sep 18, 2010 3:12 pm

waitup wrote:I assume that parusha guy who got banned from the prodigy forum makes one... have you seen his site? it's something like diy-racked.com or something.

have you seen these ones? http://don-audio.com/Front-Panels


I have seen that one Nick.....but it's brown...sorry but I can't do brown. Plus the lamp and the HF atten knob are cluttered.

Also, I've heard varying reports on the purusha chap so I'm not really going to go there.

I've dealt with Pete from Grand Master before and he's all good. I'm waiting for his email reply on price.
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Re: Gyraf Pultec Style EQ Finished

Postby Ben M » Sat Sep 18, 2010 3:14 pm

Chris H wrote:
Chinagraf wrote:Perhaps you would prefer this gear ...



........Ah! The Hallam Rack........ I prefer the one I sleep with!
:ar!



Chris...err....you sleep with a rack case? That's committed.
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Re: Gyraf Pultec Style EQ Finished

Postby Ben M » Wed Nov 17, 2010 9:03 pm

Hi all
*Warning Gpultec porn with occasional front panel nudity.

Finished these today and they powered up and performed a treat.

Big thanks to Nick and Blake for their help.

Peace
Gpultec 3.jpg
Gpultec 1.jpg
Gpultec 2.jpg
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Re: Gyraf Pultec Style EQ Finished

Postby rick » Thu Nov 18, 2010 1:55 pm

hey they look great , but where is all the stuff thats supposed to be inside ..?
inducters and tubes and stuff?
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Re: Gyraf Pultec Style EQ Finished

Postby Ben M » Thu Nov 18, 2010 2:44 pm

Gpultec.. Rick....Gpultec.

This is a simplified circuit and no interstage.
Inductors are there...see if you can pick them out.
The valves are Siemens (gold pins) E188CC matched and supplied by Andrew Kay.

I was really surprised at how good these units sound and how quiet they are. And even more surprised they worked great first time.

Ta, I'm glad you likey.
:)
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Re: Gyraf Pultec Style EQ Finished

Postby rick » Thu Nov 18, 2010 3:34 pm

i must be going blind i am looking for big heavy things that look kinda old
i cannot see them anywhere
sure looks great though
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Re: Gyraf Pultec Style EQ Finished

Postby waitup » Thu Nov 18, 2010 9:43 pm

Good work ben, you'll get much use out of these. I actually have developed a problem with mine... when I put them on something I can't take it off.
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Re: Gyraf Pultec Style EQ Finished

Postby The Tasmanian » Fri Nov 19, 2010 7:04 am

Nice work !
The Gyraf crew really know about great EQ - so I imagine they would sound really good.
C h r i z t o w n o
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Re: Gyraf Pultec Style EQ Finished

Postby what_noise? » Fri Nov 19, 2010 11:23 pm

They look great, how hard is the build?
looking for a first time DIY
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