News: Trouble logging in? Log in from the login page.
May 22, 2019, 10:01:37 pm

Author Topic: The latest, RIAA only version  (Read 10927 times)

0 Members and 1 Guest are viewing this topic.

Offline Doc B.

  • Administrator
  • Hero Member
  • *****
  • Posts: 7704
    • Bottlehead
The latest, RIAA only version
« on: April 28, 2011, 03:12:29 pm »
(https://bottlehead.com/smf/proxy.php?request=http%3A%2F%2Fwww.bottlehead.com%2Fsc_images%2Fproducts%2F452_large_image.jpg&hash=5bf66a43235fd111da1867f45ab2e8ed)

Here's a link to more info:

http://www.bottlehead.com/store.php?crn=225&rn=452&action=show_detail
Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

Offline johnsonad

  • Hero Member
  • *****
  • Posts: 1376
Re: The latest, RIAA only version
« Reply #1 on: April 28, 2011, 04:03:26 pm »
Congrats team Bottlehead!  This is something I could become interested in.  I'm curious to the lack of adjustablility in input load both resistive and capacitive.  Is it there and I'm just missing it in the description?
Aaron Johnson

Offline Grainger49

  • Hero Member
  • *****
  • Posts: 7175
Re: The latest, RIAA only version
« Reply #2 on: April 29, 2011, 12:50:30 am »
Beautiful build.  But I miss the knobs.

Offline Doc B.

  • Administrator
  • Hero Member
  • *****
  • Posts: 7704
    • Bottlehead
Re: The latest, RIAA only version
« Reply #3 on: April 29, 2011, 04:46:20 am »
Congrats team Bottlehead!  This is something I could become interested in.  I'm curious to the lack of adjustablility in input load both resistive and capacitive.  Is it there and I'm just missing it in the description?

We can certainly adjust the load for the client when we build the preamp if they are using a cartridge that has a requirement different than the standard 47K ohms. From what I have seen the manufacturer's recommendations for loads often don't apply that well in the typical setup and to find a value that is going to get the response of the cart significantly flatter than the 47K load gives will require measuring the response curve of the cartridge/cable/phono preamp system and "cutting and trying" resistor values until you find one that's better in your particular system. We sometimes install trim pots in the Tube Repro to allow for different playback heads, and the only way to be sure we have it right is to do these response measurements. As for capacitance, the best thing to do seems to be keeping it very low, which we have accomplished with the use of an EF86 pentode at the input. That's probably the best approach, as capacitive loading seems possibly to be a "cure" for issues that should probably be addressed by resistive loading adjustment - or a different cartridge.

All that said, if someone wants to add shunt capacitance to the signal path on top of what their phono cable already adds we could probably accommodate them. These are after all custom built to order.
Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

Offline ssssly

  • Sr. Member
  • ****
  • Posts: 305
Re: The latest, RIAA only version
« Reply #4 on: April 29, 2011, 03:05:37 pm »
Would that chassis be available for purchase separately? Looks super sexy would love to rebuild my BH gear on it. Looks to be the perfect size for my sr45s, SEX, and Eros with all the extra iron and huge caps I have in them.

Offline Doc B.

  • Administrator
  • Hero Member
  • *****
  • Posts: 7704
    • Bottlehead
Re: The latest, RIAA only version
« Reply #5 on: April 29, 2011, 06:20:08 pm »
Would that chassis be available for purchase separately? Looks super sexy would love to rebuild my BH gear on it. Looks to be the perfect size for my sr45s, SEX, and Eros with all the extra iron and huge caps I have in them.

Call PB at Front Panel Express. He can help you come up with what you need. I think the price for the chassis parts is around $1000, but I may be off there. Not sure what PB would charge to do the CAD design for you.
Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

Offline ssssly

  • Sr. Member
  • ****
  • Posts: 305
Re: The latest, RIAA only version
« Reply #6 on: April 30, 2011, 04:12:37 am »
Man! I hope you misplaced the decimal.

I pMed PB, thanks.

Offline Doc B.

  • Administrator
  • Hero Member
  • *****
  • Posts: 7704
    • Bottlehead
Re: The latest, RIAA only version
« Reply #7 on: April 30, 2011, 05:18:54 am »
Man! I hope you misplaced the decimal.



Nope. Along with that very cool case this preamp has about everything we can throw at it, V-Caps, tantalum resistors, Goldpoint switches, you name it. Quite a few thousands worth of parts go into making that puppy.
Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

Offline keto

  • Full Member
  • ***
  • Posts: 143
Re: The latest, RIAA only version
« Reply #8 on: May 04, 2011, 06:05:34 am »
It looks amazing and probably sounds... even better :-)
Tom Jones

Offline Dobs

  • Jr. Member
  • **
  • Posts: 35
Re: The latest, RIAA only version
« Reply #9 on: May 28, 2011, 06:30:15 pm »
Beautiful build.  But I miss the knobs.

I agree

Offline vanofmonks

  • Jr. Member
  • **
  • Posts: 21
Re: The latest, RIAA only version
« Reply #10 on: July 03, 2011, 03:58:20 am »
Can you point us to the power indicator part.  I like the look of that one.

Thanks.

Offline Doc B.

  • Administrator
  • Hero Member
  • *****
  • Posts: 7704
    • Bottlehead
Re: The latest, RIAA only version
« Reply #11 on: July 03, 2011, 05:32:25 am »
Quote
Can you point us to the power indicator part.

It's a fairly generic indicator jewel for an LED. Comes from Mouser or Digi Key, I can't remember which.
Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.