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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 3rd June 2018, 11:59 PM   #241
colnago55 is offline colnago55  United States
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Below is my attempt at an output wiring diagram for KT88ís and a Hammond 1650N output transformer.

Iím assuming that the screen inputs on the output transformer will not be used in triode mode.

Does this look right?

Thanks, Jacques
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Old 4th June 2018, 01:37 AM   #242
TheGimp is offline TheGimp  United States
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Yes, that looks good.

I use a 10 R resistor in the cathode to give easier reading of the cathode current as most of my meters are not real accurate in the low mv range. The 10R resistor does not give much feedback, but gives 10X the voltage for setting the cathode current.

Apples and oranges.
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Old 4th June 2018, 01:42 AM   #243
TheGimp is offline TheGimp  United States
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This is the basic bias supply I'm looking at.
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Old 19th June 2018, 10:37 AM   #244
Sprags is offline Sprags  United States
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Quote:
Originally Posted by Tubelab_com View Post
My boards can be ordered by sending payment via Paypal to the Tubelab email address (see below). Make sure that Paypal has your correct shipping address on file, or provide it in the comments box. State which board or boards you want, and how many in the comments box, or send a separate email with this information within a few minutes of sending payment, so that I can match it with the order.

The SSE, SPP, and TSE boards are $35 USD each. Each board makes a stereo amp with power supply.

The board described in this thread is called the UD or Universal Driver board. It is $25 due to its smaller size. Each board makes a single channel driver. Two boards are required for stereo, and a power supply for the amp is needed.

A suitable power supply schematic will be posted soon, and a PC board for it should be available within a month or two depending on PCB delivery times. I buy my current boards in batches of 100 with a 4 week delivery time to get an acceptable price. That may not be an option this time.

Shipping for 1 to 4 boards in the USA is $8. International shipment is $15.

I do not post my complete email address in plain text format in an attempt to control spam. Even still I get 20 to 30 useless emails a day. My personal email address that I have had for over 25 years gets over 100 spams a day, many loaded with evil payloads.

The address is "tech AT tubelab.com" remove the AT and replace it with the appropriate symbol without the spaces or quotes.
Will the Universal Power Supply board that is available at the DIYAudio Store work as the power supply for this amp? If I am way off base please excuse my ignorance. I'm a complete idiot when it comes to electronics.
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Old 19th June 2018, 07:35 PM   #245
colnago55 is offline colnago55  United States
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See post 202 in this thread for a schematic that George posted for a mono-block power supply for this amp.

I assume that the power supply you are referring to is not for a tube amp.
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Old Yesterday, 03:43 PM   #246
TheGimp is offline TheGimp  United States
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George, you may have gotten the notice but in case you didn't:

"Mouser Electronics received a lifecycle change notification from the manufacturer regarding a product you had interest in or purchased within the last two years. Please click on the part number to view product details and similar products for replacements.
Manufacturer Part # Mouser Part # PO# Part Status
Bourns 3309P-1-102 652-3309P-1-102 13901034 End of Life
Bourns 3309P-1-104 652-3309P-1-104 13901034 End of Life
"
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