Author Topic: Building 10x ToneBenders w/ all Tungsram AC125  (Read 363 times)

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Building 10x ToneBenders w/ all Tungsram AC125
« on: December 28, 2017, 02:43:35 PM »
Hey folks,

Boards came in from China yesterday for my ToneBender clones. the first prototype works great  :icon_cool:

I used all Tungsram AC125 transistors with an hfe close to 75.

What order of hfe have you found preferable for your builds? I'm doing my transistor matching now and I figured I'de swing by this forum to see what you guys prefer. I mean from low gain in q1 to highest gain in q3, all matched, highest to lowest.. what do you like vs what is "proper.."


Re: Building 10x ToneBenders w/ all Tungsram AC125
« Reply #1 on: December 29, 2017, 01:42:53 PM »
Consensus on this forum (you can search it) seems to be around 60-70, 60-70, 100-120 for 1,2,&3
Double check this though: the leakiest in Q1?
« Last Edit: December 29, 2017, 01:44:26 PM by blackieNYC »
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Re: Building 10x ToneBenders w/ all Tungsram AC125
« Reply #2 on: January 02, 2018, 11:41:26 AM »
Thanks for the reply!

I ended up populating them all while I wait for a few pots in the mail.

I did about 60-80 for q1, 85-95 for q2, and 100-105 for q3.

I didn't check the leakage on q1, how important is it? I could always back them out and replace them with ones with lower leakage...  I would need to know what range of leakage people aim for. My tests are done with the atlas DCA 55 and I have about 200 more AC125s.
« Last Edit: January 02, 2018, 11:43:05 AM by buildafriend »