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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 10th July 2020, 09:04 PM   #821
hobbyamp is offline hobbyamp  United States
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Same boat, will upgrade my TSE-I with a home brew TSE-II, all separated.
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Old 11th July 2020, 04:30 PM   #822
Tubelab_com is offline Tubelab_com  United States
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Quote:
Would you suggest building the TSE first the way it is supposed to be built, and maybe replace the regulators later if there is a reason for it?
That is my suggestion for just about anything home built, including projects that I but with full intent on modifying them. I make sure it works as intended, then make my mods, one at a time, testing and evaluating each mod for a few days.

The reason is simple, you have all these great ideas to make something better, so you make the changes, build it all and it doesn't work. How do you troubleshoot it? Say it does work, but the sound (or other function) isn't what you expected. Is this due to the original design, or one or more of your mods. How do you know which?

I would recommend building the TSE or TSE-II as designed, then evaluating it for a few days, perhaps test assembled on a piece of scrap wood or something similar. Test, tweak and mod as desired, then build the final cabinet.

There have been two users in Europe who had a faint hum due to low line voltage. Both were fixed by adding more capacitance in parallel with C1. If this is an issue, you could always make the mods to run the output tubes on your regulators leaving the 5842's powered from the onboard supply.
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Old 11th July 2020, 04:59 PM   #823
winggo is offline winggo  United States
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Default analog volt meters

What analog volt meters would you use to adjust bias with the amp installed in enclosure.
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Old 15th July 2020, 05:34 PM   #824
canersahin is offline canersahin  United States
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Hello everyone,

I would like to know if anyone from SOCAL would be interested in these parts. I bought these parts to complete my TSE-1 but actually never had a chance to finish it.

None of these parts used more than an hour I would say.

James Audio Choke: JS-10-200S (10H 200ma)

James Audio OT: JS-6123HS (These transformers were designed with 2A3 and 300B tubes in mind, but there are many tubes that would work well with this versatile transformer since it gives you 2.5k as an option in addition to 3.5k and 5k.)

James Audio PT: JS-9612-2 (Primary impedance: 110V * 2 Secondary impedance: S1 400V-350V-0-80V-350V-400V Current: 0.35A S2 5V Current: 4A S3 6.3V-CT Current: 3A S4 5V-6.3V Current: 3A S5 5V-6.3V Current: 3A)

300B tubes: Electro harmonix gold. Matching Pair.

Step Ladder Type Attenuator Potentiometer 50K Log Stereo.

Temco Motor Run Cap: 100uf

Some Russian teflon caps.

Raytheon 584WA pre-amp tubes.

Pictures: Items for sale - Album on Imgur
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Old 15th July 2020, 06:03 PM   #825
brl0301 is offline brl0301
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pm sent
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Old 23rd July 2020, 04:44 PM   #826
winggo is offline winggo  United States
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Default Low tube plate voltage

I just got the amp installed in the chassis and did check on B+ and tube plate voltage. The B+ was down from 400 to 360 and the plate voltage was down to 3.57. I am using 300b tubes so the plate volts should be 5. They were 5 before I installed everything on the chassis. I am using the 125v tape to the Hammond 276x pt I think that was what I was using before. Any ideas why this would change?
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Old 24th July 2020, 12:58 AM   #827
winggo is offline winggo  United States
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After letting the amp run for awhile I noticed that the B+ voltage was slowly decreasing. After about 40 min it went from 354V to 327V. The plate volts stayed about 3.53 V.
Could this be a bad OP or could there be something drawing increased voltage on the board?
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Old 4th August 2020, 04:35 PM   #828
gillougillou is offline gillougillou  France
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To follow
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Old 4th August 2020, 10:37 PM   #829
brl0301 is offline brl0301
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Quote:
Originally Posted by winggo View Post
After letting the amp run for awhile I noticed that the B+ voltage was slowly decreasing. After about 40 min it went from 354V to 327V. The plate volts stayed about 3.53 V.
Could this be a bad OP or could there be something drawing increased voltage on the board?
My TSEII does the same thing. I havent been able to figure out what was causing it
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Old 5th August 2020, 03:19 PM   #830
winggo is offline winggo  United States
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I think my rectifier tube was bad. Put in new one and got good voltage numbers.
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