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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 1st December 2019, 11:07 AM   #21
justmikey is offline justmikey  United States
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Default OPT connections

It would appear on the secondary side that 6 is the common or - connection and then you select one of the others as the + depending on the desired impedance. It would appear on the primary side that P is the tube plate connection and B is the B+ connection.
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Old 24th January 2020, 06:04 PM   #22
itsikhefez is offline itsikhefez  United States
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300B SE OPT & Choke choice
Thanks justmikey, missed your post but thatís what I ended up doing.

The ISO are installed and working nicely.
I ran a square wave and FR measurement in ARTA.

Different circuits but comparing to this shootout,
http://www.tubesoundelectronics.de/t...ot_etf2009.pdf
Looks like the ISO are very good to excellent performers?

Can someone explain how to evaluate the HF resonance and overshoot as was done in the shootout?
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Old 17th June 2020, 11:36 AM   #23
cobar53 is offline cobar53  Australia
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I have never seen a code for the power supplies wiring - such as what each of the T holes on the PCB equate to. Can someone help?


Wayne
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Old 17th June 2020, 01:11 PM   #24
Tubelab_com is offline Tubelab_com  United States
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I was posting it in your two other threads as you wrote this. Once is usually enough.

Tubelab SE 300b Build Thread
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Old 13th July 2020, 09:17 AM   #25
minerwelder is offline minerwelder  United States
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So how much for transformers with shipping?
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Old 13th July 2020, 04:43 PM   #26
itsikhefez is offline itsikhefez  United States
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300B SE OPT & Choke choice
When I bought them directly from ISO the cost was:
FC-20S output transformers -- $473/pr
LC-10-200DII choke -- $137/ea
$85 FedEx shipping to US from Japan.

I think they had a price increase since then, but at the same time there is now a US distributor so could influence prices and availability.
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