78 RPM Record Phono Pre-Amp EQ Selection Advice Wanted

I am in the initial planning on doing a 78rpm tube based phono pre-amp using a unused Pam-1 as the building block.
In researching the EQ requirements and downloading 30+ articles I found that there was absolutely no consistent standards and the standard that a record company used was
very loosely adhered too. Basically when you bought a 78 the EQ you got was like a box of chocolates - you never new what you were gonna get

I want to keeps things relative simple so I don't intend to accommodate Vertical cut records as I don't have any or intend to buy any.
I would like to keep the Turnover and Rolloff selection to 6 ea. since I have the switches in my parts bucket. I don't need to spend any money except to getting a
front panel made and buying pwbs. The Heathkit WA-P2 gets the number down to 4 ea and the article from Elliot Sound Products makes a very good case for using
4 turnovers and 5 rolloffs.

So with all that just said, anyone hear have any experience in playing 78's and what would be your advice on a direction I should take.

Have you looked on the Vinylengine website?

TN Allen wrote:Have you looked on the Vinylengine website?

Thanks for the sujestion, I will see what info they may have.

You are welcome. I looked up one of the Vinylengine members who had done an interesting preamp. His name is Coffee Phil. I found a few posts and a schematic. Although you indicated you plan to modify an existing Dynaco preamp, perhaps his schematic will provide some useful ideas.

I am interested in what you decide to do as I would like to have a preamp that accommodates the variety of 78 equalization challenges.

https://www.vinylengine.com/turntable_forum/viewtopic.php?t=40620

You may find more from Coffee Phil, I saw his earlier posts on his preamp several years ago. Perhaps he would respond to questions you have.

I read that you are not interested in Edison discs. Just in case you change your mind this is worth hearing/watching. I've changed to small(LP) stylus as a result, and the difference in sound is remarkable. It makes sense though as the Edison disc grooves are closer in dimension to LPs than to 78s.

https://www.youtube.com/watch?v=9POAWT1uf54

Thanks for the links, checking them out.

Have a look at this, there are other ones out there as well.

ltusler wrote:Have a look at this, there are other ones out there as well.

https://www.lpgear.com/product/GSPJAZZ.html

Thanks for the link, checking it out

TN Allen wrote:You are welcome. I looked up one of the Vinylengine members who had done an interesting preamp. His name is Coffee Phil. I found a few posts and a schematic. Although you indicated you plan to modify an existing Dynaco preamp, perhaps his schematic will provide some useful ideas.

I am interested in what you decide to do as I would like to have a preamp that accommodates the variety of 78 equalization challenges.

https://www.vinylengine.com/turntable_forum/viewtopic.php?t=40620

You may find more from Coffee Phil, I saw his earlier posts on his preamp several years ago. Perhaps he would respond to questions you have.

I read that you are not interested in Edison discs. Just in case you change your mind this is worth hearing/watching. I've changed to small(LP) stylus as a result,  and the difference in sound is remarkable. It makes sense though as the Edison disc grooves are closer in dimension to LPs than to 78s.

https://www.youtube.com/watch?v=9POAWT1uf54  

In checking this out another link was referenced, http://www.hagtech.com/pdf/monogram.pdf ,  for a Phono Pre-Amp. This article provided everything you would need to build the unit: Schematics, PWB layout and Chassis layout, Parts list and Silkscreen layouts. He gets it down to 6 turnovers and 5 rolloffs.