Search found 113 matches
- Fri Mar 29, 2024 11:41 pm
- Forum: Vox/Hiwatt Discussion
- Topic: Hiwatt DR504, looking for a little info
- Replies: 5
- Views: 1664
Re: Hiwatt DR504, looking for a little info
it looks like transformer made by Heyboer
- Fri Mar 29, 2024 11:24 pm
- Forum: Technical Discussion
- Topic: uTracer (Micro Curve Tracer)
- Replies: 300
- Views: 84782
Re: uTracer (Micro Curve Tracer)
Did you maybe try V6.2 version?
- Wed Mar 27, 2024 1:34 pm
- Forum: Technical Discussion
- Topic: Fryette Power Station
- Replies: 18
- Views: 1423
Re: Fryette Power Station
You have something lake that: Boss Waza TAE
- Sun Mar 24, 2024 4:42 pm
- Forum: Technical Discussion
- Topic: Fryette Power Station
- Replies: 18
- Views: 1423
Re: Fryette Power Station
more pictures
- Sat Mar 23, 2024 5:11 pm
- Forum: Technical Discussion
- Topic: Fryette Power Station
- Replies: 18
- Views: 1423
Re: Fryette Power Station
no schematic available, as I know
check the picture for internals
check the picture for internals
- Sat Feb 03, 2024 5:39 pm
- Forum: Marshall Discussion
- Topic: Marshall Hot Rod diode clipping connection method difference?
- Replies: 8
- Views: 911
- Thu Dec 14, 2023 8:14 pm
- Forum: Dumble Discussion
- Topic: Dumble video/sound clip reference, real Dumbles only please
- Replies: 383
- Views: 350177
- Sun Oct 15, 2023 5:27 am
- Forum: Marshall Discussion
- Topic: Primary impedance of original jtm 45 ot?
- Replies: 18
- Views: 7239
Re: Primary impedance of original jtm 45 ot?
If put all the results in this online calculator step-down ratio looks OK
https://www.hagtech.com/loading.html
https://www.hagtech.com/loading.html
- Sun Oct 15, 2023 5:26 am
- Forum: Marshall Discussion
- Topic: Primary impedance of original jtm 45 ot?
- Replies: 18
- Views: 7239
Re: Primary impedance of original jtm 45 ot?
If I apply 400hz AC signal 1V RMS on secondary, on primary I'm getting 26.65V RMS, so it should be OK with 6.5K/8R relation
- Sun Oct 15, 2023 5:25 am
- Forum: Marshall Discussion
- Topic: Primary impedance of original jtm 45 ot?
- Replies: 18
- Views: 7239
Re: Primary impedance of original jtm 45 ot?
With 1Khz C settings and from Ub+ to secondaries I'm getting 1440pF
- Sun Oct 15, 2023 5:24 am
- Forum: Marshall Discussion
- Topic: Primary impedance of original jtm 45 ot?
- Replies: 18
- Views: 7239
Re: Primary impedance of original jtm 45 ot?
understand that, but is the same like inserting voltage on primary and measure sec. , calculate by hand? did you check and confirm ? :P put 1khz C setting and try from Ub+ to secondaries.. should be around 1-5nF if is good trafo, if doesnt measure try via normal multimeter, on C selector, usually i...
- Sat Oct 14, 2023 8:55 pm
- Forum: Marshall Discussion
- Topic: Primary impedance of original jtm 45 ot?
- Replies: 18
- Views: 7239
Re: Primary impedance of original jtm 45 ot?
hi neskor, can you explain what exactly you are measuring = 6.5k ohms here? when you have this trafo on hand , how much is parasitic capacitance between P and S? any tap is ok 6.5K is primary impedance with 8R on secondary I tried to measure parasitic capacitance between P and S but results vary to...
- Sat Oct 14, 2023 7:12 pm
- Forum: Marshall Discussion
- Topic: Primary impedance of original jtm 45 ot?
- Replies: 18
- Views: 7239
- Sat Oct 14, 2023 5:53 am
- Forum: Marshall Discussion
- Topic: Primary impedance of original jtm 45 ot?
- Replies: 18
- Views: 7239
Re: Primary impedance of original jtm 45 ot?
[/quote] Have you checked the high frequency to ultrasonic frequency and phase response of your’s? Mine has a weird resonant peak and phase shift around 40kHz. [/quote] I didn't I don't have balanced signal generator, maybe runing the secondary with SG and solid state amp will work, but never tried....
- Fri Oct 13, 2023 8:45 pm
- Forum: Marshall Discussion
- Topic: JCM800 2203 Hermansson 5-Stage
- Replies: 9
- Views: 3337
Re: JCM800 2203 Hermansson 5-Stage
maybe something like this