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Tea-Bag Tea-Bag is offline

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diyAudio Member

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About Me

  • About Tea-Bag
    Biography
    I hope to listen and understand
    Location
    Kennebunk
    Interests
    Cycling, Audio, japanese maples
    Occupation
    computer networker
    Country
    United States
    Previously Known As
    mithomas
    Real Name
    Mike Thomas
  • Signature
    Salas Boards 2014 #2 SHIPPED |F5TC board and power supplies available PM | Hot-Rod DCB1 boards and kits available PM |Mesmerize kits available (no boards)

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General Information
  • Join Date: 8th February 2006

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Showing Friends 1 to 9 of 9

Blog

View Tea-Bag's BlogRecent Entries
Latest Blog Entry

Posted 27th January 2013 at 12:48 PM by Tea-Bag Comments 12
Posted in Uncategorized
Here is the F6 board rendered by CRT and some help from others.




It's convertible premise is to be able to swap out transformers using daugter cardsand be able to swap out variations on the schematics Nelson Pass presented at the 2012 Burning Amp Festival.
Additionally, places for two pairs of 2SK/2SJ are here to allow GR's to be used to allow for higher than 8ma IDSS without degeneration on the front end. If you have 8ma IDSS BL grade for use here, than your all set.
You can use standard power resistors or 5MM thin film type.



Here are some of the daughter cards that mount to the main board. They are available for Jensen, Cinemag and Onetics Quadfilar transformers.
These are mounted with 2 2x10 @ 2.54 mm pins. Note the PC PINs of...

Posted 10th October 2012 at 05:55 PM by Tea-Bag Comments 0
Posted in Uncategorized
Here are some pictures of the Power Supply that CRT and myself designed for use with the F5T and F6Convertible design. It is meant to be both compact, have adequate capacitance, and be able to use the recommended MUR3020W or similiar diodes. They are 2.5mm thick boards with 3OZ copper thickness.

(Updated boards take now 40mm wide caps and are larger measurements below and new pics)



Boards measure 108mm wide x 192mm long. The diode boards are 35mm x 54mm each.









...

Posted 7th January 2012 at 09:13 AM by Tea-Bag Comments 2
Posted in Uncategorized
This last weekend I replaced the IRFP240 in my F2 Clone with the R100 SouthSemi Power-JFET.

tubes-guy used psychic powers to control my mind and force me to do it.

The bias dropped off the bat. I re-biased and gave it an A-B listen to the standard channel. Seemed to be a bit 'cleaner' sounding the the default channel.

Nelson has recommended the following changes to the circuit, which I hope to implement soon. I will be re-wiring these on Peter Daniels boards.
The Peter Daniel boards are still available I believe.
http://www.diyaudio.com/forums/group...group-buy.html

Papa sayz...

The F2's that I have updated with the JFETs need the
following changes:

R6 = 47k (changed to 8.2K of FW Site)

C1 = 10 uF

Z1 removed

The potentiometer must be re-adjusted for minimum
distortion at 4.5 watts (symmetric clipping) and readjusted
...

Posted 16th September 2011 at 01:37 AM by Tea-Bag Comments 1
Posted in Uncategorized
Here I am going to post some semi-commercial information regarding the minikits.



BIB or SSLV1.1
Make sure to read the full BiB build manual before ordering parts. The link is posted below.
BIB BUILD GUIDE REV2 BY SALAS

It is essential you understand and purchase for the correct voltage type and range you need for this kit and additional parts.

The purpose here is to report what parts are included in the minikit, and which are not.
This will assist builders in getting the correct parts that are not included in the minikits.

The minikits are made for one of the three sections of the PCB. The board itself can hold two positive and one negative rail type supply.

The kits are purely optional, and are sold to assist the buyer who may not be able to access the resources needed to gather the specific parts.

There are four kit types described below. IRF for voltage 5.5v...

Posted 8th August 2010 at 09:29 PM by Tea-Bag Comments 0
Posted in Uncategorized
So I believe I am finished with the Mini-A version modified for SemiSouth R100 output. The MJ is not in reference to Michael Jackson, rest his soul. Simply a reference to Mosfet input, JFET output.

Technical pieces:
R8 is a 1K pot. This allow for some DC offset adjustment.
R18, This affects drain current to differential pair. This value is lowered. I chose 220R resistor since I have a bunch of them. Papa presented this as needed on mod's in general for the lower VGS of the R100 (~1.5v)
R19, gate resistor to Power JFET R100. This is lowered to 47R. We see with F1J and F2J that gate resistors are lower.


Rail Voltage is +/-24v
Source voltage is .425v and is largely determined by the 100K pot settings and heatsinks on hand. The real value of the pot is ~ 70-80k here. I let the IRF240's run no higher than 65c and R100's no higher than 70c.


Sound

Previously I had R18 at 392 default and R19...
Recent Comments
Mesmerize Hot Rod Kit...
Posted 12th May 2014 at 02:29 PM by Tea-Bag Tea-Bag is offline
Where is the bom for...
Posted 4th November 2013 at 10:16 PM by mk57 mk57 is offline
Great work mate.
Posted 5th October 2013 at 10:41 AM by 2 picoDumbs 2 picoDumbs is offline
the pics are currently...
Posted 12th June 2013 at 01:32 PM by Tea-Bag Tea-Bag is offline
Unable to see the images....
Posted 12th June 2013 at 10:23 AM by bravi bravi is offline
Hide this!Advertise here!

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