Sowter 8650 - UA 175 trx measurements
« on: May 12, 2020, 02:47:53 PM »
Hi folk!
Have on hands a pair of Sowter 8650a trxes. It's a substitute for UA 175 as output trx. Can be used in  other output amps with PP topology.

I'm studyng transformers and have a plan to wind my own tranies so I measure every transformer that falls into my hands.
Make measurements of DCR and inductance on two friencies (pretty simple LCR meter).
If you have an ideas what additional specs I should measure - feel free to give an advice.
« Last Edit: May 12, 2020, 03:11:33 PM by dirty1_1garry »


ruffrecords

Re: Sowter 8650 - UA 175 trx measurements
« Reply #1 on: May 12, 2020, 05:21:00 PM »
Always worth measuring leakage inductance as well. Gives you a better idea of HF response.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

Re: Sowter 8650 - UA 175 trx measurements
« Reply #2 on: May 12, 2020, 07:53:24 PM »
Always worth measuring leakage inductance as well. Gives you a better idea of HF response.

Thanks for your response, Ian!

Already measured it, but result confused me a little bit. Primary inductance with secondary shorted gave me 310mH(1kHz) and 19.58H(120Hz) on RED-CT and 403mH(1kHz) and 27.26H(120Hz) on GREEN-CT. Is it normal results?

ruffrecords

Re: Sowter 8650 - UA 175 trx measurements
« Reply #3 on: May 13, 2020, 07:12:15 AM »
Thanks for your response, Ian!

Already measured it, but result confused me a little bit. Primary inductance with secondary shorted gave me 310mH(1kHz) and 19.58H(120Hz) on RED-CT and 403mH(1kHz) and 27.26H(120Hz) on GREEN-CT. Is it normal results?

The mH readings seem more typical to me. What meter are you using to make the measurements?

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

Re: Sowter 8650 - UA 175 trx measurements
« Reply #4 on: May 13, 2020, 07:31:54 AM »
The mH readings seem more typical to me. What meter are you using to make the measurements?

I used E7-22 LCR meter. It's same as EXTECH 380193. It has two frieqencies and gives fairly accurate results as I compare it with Instek LCR-6300.

ruffrecords

Re: Sowter 8650 - UA 175 trx measurements
« Reply #5 on: May 14, 2020, 04:38:34 AM »
I used E7-22 LCR meter. It's same as EXTECH 380193. It has two frieqencies and gives fairly accurate results as I compare it with Instek LCR-6300.

They should be plenty good enough. I must admit I do not often measure leakage inductance and when I have it has probably been at 1KHz. I will try a couple at 100Hz and let you know the results.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'


 

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