Video 1: 
3 bands of glory

Video 2: 
No more concerns

Video 3: 
The final countdown

Welcome – friend of the real sound!

Tube PROGRAM Equalizer

the complete kit

Build Your Legend Series No. 2

The Tube Program Equalizer featuring the legendary Pultec EQP-1A

In this video & epaper series I will show you everything you need to know about this famous passiv tube equalizer and
– more importantly –
how to get this legendary piece of gear in your studio by building one yourself! 

Part I


3 bands of glory

Ok – first, let’s start with the video. In this introduction I’ll give you a brief and basic overview about the iconic tube program equalizer aka the Pultec EQP-1a. We’ll also listen to it and dive a little deeper into how it does its magic… 

As I didn’t want to stretch out the first video too much, I also made a very detailed and dense 8-pages e-paper for you, in which I go to the heart of it. It’s the first e-paper of this Build Your Legends Series and you can just download it – as always – for free!

You’re welcome 😉

don't take just my word for it

what others are saying so far...

Part II


No more concerns

Inspired by your comprehensive feedback over the last two weeks (see comments below), I decided to take a turn and dedicate this video completely to your main questions and concerns which seems to hold a lot of you back from building your own gear.

As a professional interpreter, I work on rockets and I deal with precision-machined parts and finishes on a daily basis. The execution (sheet metal bending, cut-outs) and the paint job is absolutely fantastic! Way to go! Your hard work means a lot to us gear heads.



Community member who actually works with rockets 😉

This e-paper is all about the possible concerns and obstacles you might have getting your hands on analog gear DIY-Style. It tackles the four main topics I distilled from your feedback – 1. Safety, 2. Skills & Tools, 3. Parts, 4. Troubleshooting – and will leave you with no more concerns, hopefully…

small intermission

Big Announcement

Something really great happened the last couple of days. Didn’t see that coming but it definitely is a huge step towards the 100% we’re striving for in terms of a faithful re-creation of the vintage Pultec EQP-1A!

Part III


The final countdown

I really had a lot of fun shooting these videos and I hope you also had fun watching them – and more importantly will have even more fun Building Your Legend.
So now, your turn – plug out and play the real thing:

Tube PROGRAM Equalizer

the complete kit

Special Group Buy Price: 1299.00 €

What you get

High quality chassis + every single component
(click on the + for details)

  • hammer finish powder coated back chassis
  • original style hammer finish powder coated filter enclosures (2x)
  • powder coated & silk-screened front panel
  • all cut-outs for every single component:
    no cutting, drilling or filing
  • made & engineered in Germany
  • original Pultec Bypass switch made by Switchcraft
  • FIRST 100 kits will be supplied with VINTAGE Pultec bypass switches
  • inductor/filter coil made to original specs by Moby Electronics – potted in bees wax just like in the original units
  • high frequency filter caps custom made by German audiophile cap maker Mundorf
  • high quality rotary switches custom made by Blore-Edwards in the UK (supplier for Neve etc.)
  • potentiometers with authentic log curve custom made by Blore Edwards/UK to original specs of vintage Allen&Bradley pots
  • input-, interstage- & output transformer custom made to original specs of vintage Triad HS56, HS29 & Peerless S217-D by Beesneez Pro Audio in Australia: technically identical, same dimensions, footprint and even the same pin layout!!
  • carbon composition  resistors as used in vintage units
  • audiophile Audyn film caps for the low freq. filter section
  • authentic can capacitor by CE Manufacturing for the PSU
  • audio grade can capacitor by Mundorf for the amp section
  • high-end Russian made Genalex Gold Lion 12AX7 6 12AU7 tubes 
  • NOS (new old stock) rectifier tube
  • high quality hook-up wire by Alpha Wire
  • authentic slotted stainless steel flathead screws
  • original terminal strips made by Keystone Electronics
  • original style pilot lamp with smooth lens
  • high quality Neutrik XLR connectors

(Bill Of Included Materials)


…the complete analogvibes Welcome &  Build Your Legend Series e-paper collections
(click on the pictures to open)


…the ultimate Building Guide to make building your legend almost as easy as painting by numbers

How we’ll make it happen

As mentioned in the videos we can only make a new project happen together – meaning we are going for a GROUP BUY. We have done this several times in the past for all our available projects. It has proven to be the best way to bring these projects to life which otherwise wouldn’t have been possible.

  1. 2015 TUBE OPTO COMP V1
  5. 2017 TUBE OPTO COMP V2
  9. 2018/19 VARI-MU 176
  10. 2018/19 TUBE OPTO COMP V3

For better understanding & transparency I have set up a small roadmap for you. To be more on the safe side, the timeframes for each phase are generously estimated so if everything runs smoothly we may be quicker. But although we prepared this very carefully, if unforeseen obstacles arise (and experience tells there’s quite some possibility for that) it is also possible that it may take a little longer. 

Roadmap to your Kit

Phase I – Group Buy

Open cart for collecting pre-orders
estimated time: 2-3 weeks

Phase I – Group Buy
Phase II – Manufacturing

Production of the chassis, manufacturing custom made parts & ordering the rest of the parts
estimated time: 10-12 weeks

Phase II – Manufacturing
Phase III -Putting together the Kit

Collecting all the parts and preparing them for shipping
estimated time: 1-2 weeks

Phase III -Putting together the Kit
Phase IV – Shipping

Shipping your Kit (yesss – finally ;-).
estimated time depending on your location:
Germany: 4-7 days
Europe: 5-9 days
World: 10- 21 days
Rare countries: depending on the country

Phase IV – Shipping
Phase V – B U I L D I N G

Building Your Legend
estimated time: your call

Phase V – B U I L D I N G
All the time – keep you posted

Of course I will keep you in the loop constantly & well informed about the progress of our project.

All the time – keep you posted

Lastly some really important notes & conditions – please click on them & read thoroughly!

As we face minimal order quantities for several parts of the kit we’ll need at least 30 kits pre-ordered to make it happen. If we should somehow not reach that goal (I really don’t think so) the group buy is off and we will refund the preorders that have already been paid for. 

UPDATE: I’m extremely happy to announce we already crossed the minimum of 30 kits preordered within 48 hours after the announcement of the kit!

Thank you so much for the confidence folks and I promise you won’t be disappointed! For those of you who have been hesitating – you can now join the preorders with your minds set at ease 🙂

Please check our shipping information: click here 

Please Note that if your are located outside the EU there may be additional costs for import duty & taxes. Please check with your local authorities.

With your pre-order you agree to opt in to the analogvibes newsletter so we can keep you up to date with the progress.

The already finished e-papers will be sent to you with the order confirmation. The upcoming ones follow via email once the kits are ready for shipping.
We highly recommend though, that you create an account during checkout, so you have all the e-papers in their latest versions – always accessible in one place. 

Any questions left? If yes, put them in the comments for me, so I can reply to them. Maybe some others have the same questions (praise is also welcome ;-).
You might also have a quick look at the Meet-The-Legend-Page of the Pultec EQP-1A for details on that legendary piece of gear.

All set? 

Well, then go for it!

& also let others know about our analog passion:

Share on email
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Feel free to leave me a comment…

In case you are wondering, most comments are answers to the questions below which I asked at the beginning of the series.

  • What are your top two or three questions about building the upcoming tube program EQ  that you’d want me to answer in the BYL-Series? 
  • What are the major obstacles or doubts that are holding you back from starting to build your own gear?

Or –  if you already started to build your own gear:

  • What were the major obstacles holding you back in the beginning and how did you overcome them? 

This Post Has 38 Comments

  1. Why did you decide on the greyish-blue front panel color moving away from the original blue (like the chassis kit)? I thought the EQ is supposed to be as close to the original as possible.
    Regards, Peter

    1. Hey Peter,
      I made the decision, because the greyish-blue is closer to the original 🙂
      When I made the first EQ I didn’t have an original Pultec unit at hand, so I had to judge by recommendations and literally pics I found on the web.
      But now someone from the analogvibes community sent me an original Pultec EQH-2 and I could compare the colors.

      So in short: the new color will definitely be closer to the original
      hope that helps

  2. I finally came up with a couple questions, though you may find the first a bit sacrilegious. I have intention of using all my analog in a hybrid workflow. For recall purposes, it seems like having stepped controls is ideal. For stereo purposes, it seems like rotary switch attenuators are ideal. But the cost for an Elma A47 or similar Goldpoint, populated or bare, seems very high. Especially when considering something like the Pultec EQP1, which would require 4-5 fine-step controls to be truly useful.
    So my question is, is there an affordable way to implement stepped controls, such as a custom circuit board complement to inexpensive, readily-available switches? And would this be more time consuming in the end than using recall sheets and listening carefully dial-in the matching settings?
    The only other question on my mind is how to calculate appropriate resistor values to safely discharge higher value capacitors before working on gear that has been powered. And relatedly what sort of resistor selection to keep on hand for this, and also in general? (Coming mainly from working on kits, I don’t have a large selection of surplus components.)
    Thanks, Martin!

    1. I keep a 5 or 10 watt resistor for that on hand, covered in textile tape, to pich it up with pliers

  3. Hallo Martin,

    Danke für die Arbeit die ihr in dieses Projekt reinsteckt.
    Über die letzten Jahre habe ich durch eine Vielzahl an Projekten die ich im Gitarrenverstärkerbereich und eben im Bereich der analogen Studiogeräte
    durchgeführt habe erfahren dürfen wieviel Spass das ganze macht aber eben auch wieviel Arbeit dahintersteckt wenn man nicht nur 0815 -mässig was zusammenbrutzeln will. Daher noch einnmal Hut ab vor dem was ihr bei analogvibes auf die Beine stellt.
    Fragen zum Aufbau der Geräte habe ich eher weniger mir geht es im Vorfeld noch einmal darum zu erfahren mit welchem Umfang der Kit kommt bzw. wo ich noch Teile beschaffen muss.
    Ich freue mich sehr darauf in Zukunft hoffentlich 2 EQP-1a’s im Rack zu haben. Mein Opto-Comp ist gerade fertiggeworden und macht mir viel Freude.

    Viele Grüße,

  4. Hi Martin, I really love your eye for detail and the seemingly high accuracy in performance of the EQP1a. A few years ago I build an Igor design of a Sontec MEQ5 and I use it daily (just waiting for JLM to release his Sontec DOAs on a normal footprint).

    I cannot wait to start building some EQP1as. But with a twist: I actually want to try to use two EQP1as as a pair for mastering, I want a box that is far from clean and has lots of mojo and already adds vibe in bypass. So my mod would be switched rotaries and all parts matched for stereo use. Most likely I’ll have to spend a lot of time getting them within 0.1dB from each other (if I fail I’ll just use one for mastering bass on the M of the M/S channel and use the other in my studio for tracking/mixing).

    So to answer your question:

    What were the major obstacles holding you back in the beginning and how did you overcome them?
    I have built discrete digital electronics for 40 years now and I love computers, but in my studio I rely on analog audio, and as you know as no other, that is a completely different ball park. Main obstacle for my Sontec build was the shear cost before even beginning in combination with having to trust that I will be able to find and correct any mistakes. In the end I actually did not make any mistake and the machine measured amazing. Although in hindsight I wished I had spent a few thousand more on Elma switches instead of Chinese ones that feel very cheap and not durable (no failure yet though).

    So the fear of my failure vs the initial costs was a thing for me. To overcome it I bought parts cheap and in batches, pcb + electronic parts first, then the case + switches and at last hunting down a pair of Forsell DOAs. But the end-result gave me a lot trust that I can build pro audio grade circuits even when soldering 428 resistors by hand looks very daunting and error prone.

    Cheers for all your time and effort you have put in sharing your reproductions, Joshua

  5. Hi Martin,

    I am a freelance engineer at Bias Studios in Springfield, VA U.S.A

    My response for the questions:

    Will the kit consist of high quality parts? What kind of transformers and what tubes will be included? What switches will be included and if there will be an option to have a stepped mastering edition added at an additional cost?
    I have only been building gear for less than a year, but it has overcome my being. The difficulties I had and still have is a complete understanding of electronics. I know some , but I really want to develop a strong foundation in electronic knowledge, especially in audio electronics. Another thing that I had to overcome is having a steady hand for soldering and being extremely organized, on an OCD level, to make sure I am installing the correct components. I remember my first build I messed up on an op-amp build for a pre and next thing I know one of the resistors caught on fire! It was amazing, but the learning experience of troubleshooting the issue was the best part.
    I can’t wait for this kit to come out! I would like to know what the ball park range of the price will be and how much shipping will cost to the United States?

    Many thanks,


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