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Valve Headphone Amp

Last post by simon « Wed Oct 15, 2025 1:21 pm
Replies: 62
by simon » Sat Apr 15, 2023 11:38 am
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62 Replies

182364 Views

Last post by simon
Wed Oct 15, 2025 1:21 pm
What is SPICE

Last post by Nick « Wed Oct 15, 2025 9:43 am
Replies: 219
by pre65 » Mon Dec 03, 2007 1:22 pm
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219 Replies

396253 Views

Last post by Nick
Wed Oct 15, 2025 9:43 am
Diode query - which is cathode leg of flat TO-220?

Last post by Nick « Sun Sep 14, 2025 2:31 pm
Replies: 9
by adrian » Mon Sep 01, 2025 11:25 am

9 Replies

20754 Views

Last post by Nick
Sun Sep 14, 2025 2:31 pm
Any recommendations?

Last post by Paul Barker « Sun May 18, 2025 2:40 am
Replies: 14
by franzbenda » Thu May 15, 2025 3:38 pm

14 Replies

175808 Views

Last post by Paul Barker
Sun May 18, 2025 2:40 am
HT and filament heating from the same transformer

Last post by Morgan Jones « Wed Jan 08, 2025 10:29 pm
Replies: 7
by Thermionic Idler » Mon Dec 30, 2024 2:58 pm

7 Replies

106438 Views

Last post by Morgan Jones
Wed Jan 08, 2025 10:29 pm
My Niece's First Vinyl System

Last post by Ray P « Sun Jan 05, 2025 6:35 pm
Replies: 59
by Ray P » Sat Aug 31, 2024 1:11 pm
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59 Replies

214337 Views

Last post by Ray P
Sun Jan 05, 2025 6:35 pm
Help understanding Smoothing Capacitor Ripple Current

Last post by Morgan Jones « Sun Sep 29, 2024 11:21 am
Replies: 2
by RhythMick » Mon Sep 09, 2024 11:05 am

2 Replies

27694 Views

Last post by Morgan Jones
Sun Sep 29, 2024 11:21 am
Speakers

Last post by Daniel Quinn « Thu Sep 26, 2024 2:44 pm
Replies: 23
by Daniel Quinn » Tue Sep 17, 2024 5:28 pm
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2
23 Replies

66836 Views

Last post by Daniel Quinn
Thu Sep 26, 2024 2:44 pm
Seeking Cartridge Recommendations

Last post by Morgan Jones « Sun Sep 22, 2024 8:21 pm
Replies: 14
by Ray P » Sat Sep 21, 2024 7:26 am

14 Replies

84421 Views

Last post by Morgan Jones
Sun Sep 22, 2024 8:21 pm
Isolation Transformers

Last post by Paul Barker « Tue Jul 16, 2024 6:17 pm
Replies: 21
by simon » Sat Jul 13, 2024 3:09 pm
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2
21 Replies

70848 Views

Last post by Paul Barker
Tue Jul 16, 2024 6:17 pm
Pot Impedance

Last post by Mike H « Fri Mar 15, 2024 8:12 pm
Replies: 3
by Cressy Snr » Wed Mar 13, 2024 2:12 pm

3 Replies

40379 Views

Last post by Mike H
Fri Mar 15, 2024 8:12 pm
You know how polypropyline motor run caps…..

Last post by Paul Barker « Mon Jan 29, 2024 6:56 pm
Replies: 9
by Paul Barker » Sun Jan 28, 2024 9:09 am

9 Replies

42055 Views

Last post by Paul Barker
Mon Jan 29, 2024 6:56 pm
Interstage transformer ratio.

Last post by Paul Barker « Wed Dec 27, 2023 10:26 am
Replies: 6
by pre65 » Tue Dec 12, 2023 7:50 pm

6 Replies

55735 Views

Last post by Paul Barker
Wed Dec 27, 2023 10:26 am
Microwave oven transformers.

Last post by pre65 « Fri Nov 24, 2023 11:36 pm
Replies: 2
by pre65 » Fri Nov 24, 2023 11:17 pm

2 Replies

31018 Views

Last post by pre65
Fri Nov 24, 2023 11:36 pm
Soft start query

Last post by Paul Barker « Thu Aug 31, 2023 8:29 am
Replies: 5
by iansr » Sun Jan 08, 2023 4:24 pm

5 Replies

38668 Views

Last post by Paul Barker
Thu Aug 31, 2023 8:29 am
Crowhurst 1951 on feedback Alex used, some termed Schade, whoever he was.

Last post by rowuk « Fri Jun 16, 2023 8:22 pm
Replies: 1
by Paul Barker » Sun Jun 11, 2023 11:05 am

1 Replies

31404 Views

Last post by rowuk
Fri Jun 16, 2023 8:22 pm
Crowhurst 1951 on the feedback Quad used

Last post by Paul Barker « Sun Jun 11, 2023 11:12 am

by Paul Barker » Sun Jun 11, 2023 11:12 am

0 Replies

75372 Views

Last post by Paul Barker
Sun Jun 11, 2023 11:12 am
NFB capacitor

Last post by IslandPink « Thu Jun 08, 2023 9:18 pm
Replies: 26
by karatestu » Thu Feb 02, 2023 6:44 pm
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26 Replies

78687 Views

Last post by IslandPink
Thu Jun 08, 2023 9:18 pm
power supply - senior moment

Last post by ed « Wed Apr 19, 2023 4:57 pm
Replies: 2
by ed » Wed Apr 19, 2023 4:12 pm

2 Replies

35034 Views

Last post by ed
Wed Apr 19, 2023 4:57 pm
Good idea?

Last post by Mike H « Thu Feb 09, 2023 1:40 pm
Replies: 13
by Daniel Quinn » Tue Feb 07, 2023 8:23 pm

13 Replies

59534 Views

Last post by Mike H
Thu Feb 09, 2023 1:40 pm
Split rail from two positive regulators

Last post by Daniel Quinn « Mon Jan 16, 2023 8:44 pm
Replies: 17
by karatestu » Sun Jan 15, 2023 7:21 pm
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17 Replies

82001 Views

Last post by Daniel Quinn
Mon Jan 16, 2023 8:44 pm
PCF8574 to ULN2803 - have I done something daft?

Last post by Nick « Sat Jan 07, 2023 11:58 am
Replies: 20
by Thermionic Idler » Mon Jan 02, 2023 3:51 pm
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20 Replies

72423 Views

Last post by Nick
Sat Jan 07, 2023 11:58 am
DipTrace

Last post by Paul Barker « Sat Dec 24, 2022 7:49 am
Replies: 39
by simon » Tue Nov 08, 2022 4:56 pm
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39 Replies

98431 Views

Last post by Paul Barker
Sat Dec 24, 2022 7:49 am
PS advice

Last post by steve s « Sat Nov 12, 2022 7:55 pm
Replies: 11
by iansr » Sat Nov 12, 2022 9:14 am

11 Replies

49476 Views

Last post by steve s
Sat Nov 12, 2022 7:55 pm
Kicad advice

Last post by Max N « Sun Oct 30, 2022 10:11 pm
Replies: 10
by Max N » Sat Mar 05, 2022 6:28 pm

10 Replies

46181 Views

Last post by Max N
Sun Oct 30, 2022 10:11 pm
Head Scratching?

Last post by pre65 « Sun Sep 25, 2022 10:15 am
Replies: 6
by Ray P » Mon Sep 19, 2022 3:59 pm

6 Replies

42853 Views

Last post by pre65
Sun Sep 25, 2022 10:15 am
Statistical Regulator Without CCS?

Last post by Paul Barker « Thu Aug 11, 2022 12:26 pm
Replies: 5
by BenjaminSmithSeattle » Thu Aug 11, 2022 4:04 am

5 Replies

40010 Views

Last post by Paul Barker
Thu Aug 11, 2022 12:26 pm
c7 socket

Last post by Nick « Wed Jul 20, 2022 5:44 pm
Replies: 1
by ed » Wed Jul 20, 2022 5:34 pm

1 Replies

32854 Views

Last post by Nick
Wed Jul 20, 2022 5:44 pm
Transformer centre tap.

Last post by pre65 « Wed Jun 22, 2022 1:43 pm
Replies: 14
by pre65 » Mon Jun 13, 2022 10:55 am

14 Replies

54020 Views

Last post by pre65
Wed Jun 22, 2022 1:43 pm
PIO Capacitor Calamity

Last post by Thermionic Idler « Wed Jun 08, 2022 7:36 am
Replies: 7
by Thermionic Idler » Fri Jun 03, 2022 7:31 pm

7 Replies

44322 Views

Last post by Thermionic Idler
Wed Jun 08, 2022 7:36 am
Raspberry Pi in same case as DAC

Last post by Thermionic Idler « Fri May 20, 2022 9:30 am
Replies: 2
by Thermionic Idler » Sun May 15, 2022 10:15 am

2 Replies

37324 Views

Last post by Thermionic Idler
Fri May 20, 2022 9:30 am
Parallel Preamp Outputs

Last post by Ray P « Sun Apr 24, 2022 7:23 pm
Replies: 2
by Ray P » Sun Apr 24, 2022 3:06 pm

2 Replies

35134 Views

Last post by Ray P
Sun Apr 24, 2022 7:23 pm
Just need to check

Last post by Ray P « Mon Mar 14, 2022 12:13 pm
Replies: 2
by Ray P » Mon Mar 14, 2022 7:42 am

2 Replies

34219 Views

Last post by Ray P
Mon Mar 14, 2022 12:13 pm
PP output transformer

Last post by Andrew Ivimey « Sun Mar 13, 2022 1:17 pm
Replies: 9
by Andrew Ivimey » Sat Mar 12, 2022 11:53 am

9 Replies

44340 Views

Last post by Andrew Ivimey
Sun Mar 13, 2022 1:17 pm
Dedicated mains for audio

Last post by Nick « Sun Mar 06, 2022 12:02 pm
Replies: 12
by chris » Fri Mar 04, 2022 10:12 am

12 Replies

50869 Views

Last post by Nick
Sun Mar 06, 2022 12:02 pm
RCD question

Last post by Paul Barker « Tue Feb 22, 2022 8:16 am
Replies: 17
by Thermionic Idler » Sat Feb 19, 2022 3:18 pm
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17 Replies

70608 Views

Last post by Paul Barker
Tue Feb 22, 2022 8:16 am
Valve Amp Power Supplies

Last post by Nick « Tue Jan 25, 2022 4:14 pm
Replies: 42
by Cressy Snr » Sun Jan 23, 2022 5:24 pm
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42 Replies

115245 Views

Last post by Nick
Tue Jan 25, 2022 4:14 pm
Two-chassis phono stage - grounding question

Last post by Thermionic Idler « Fri Jan 21, 2022 11:01 am
Replies: 12
by Thermionic Idler » Wed Jan 12, 2022 6:27 pm

12 Replies

50861 Views

Last post by Thermionic Idler
Fri Jan 21, 2022 11:01 am
Toroidal transformer interference

Last post by Nick « Fri Dec 31, 2021 6:49 pm
Replies: 1
by Thermionic Idler » Fri Dec 31, 2021 5:34 pm

1 Replies

34140 Views

Last post by Nick
Fri Dec 31, 2021 6:49 pm
Budget DSP Options

Last post by rowuk « Thu Dec 16, 2021 7:03 pm
Replies: 11
by Ray P » Sun Dec 12, 2021 10:36 am

11 Replies

53864 Views

Last post by rowuk
Thu Dec 16, 2021 7:03 pm
Voltage regulation

Last post by Nick « Sun Dec 12, 2021 9:40 am
Replies: 16
by Daniel Quinn » Sat Dec 11, 2021 11:24 am
1

2
16 Replies

65469 Views

Last post by Nick
Sun Dec 12, 2021 9:40 am
Voltage question

Last post by pre65 « Fri Dec 10, 2021 7:07 pm
Replies: 17
by Daniel Quinn » Fri Dec 10, 2021 2:11 pm
1

2
17 Replies

63786 Views

Last post by pre65
Fri Dec 10, 2021 7:07 pm
TKD pots

Last post by Paul Barker « Sun Dec 05, 2021 7:36 am
Replies: 16
by Thermionic Idler » Fri Dec 03, 2021 6:16 pm
1

2
16 Replies

69242 Views

Last post by Paul Barker
Sun Dec 05, 2021 7:36 am
what pcb design software

Last post by malarkey1976 « Tue Sep 21, 2021 4:47 pm
Replies: 9
by ed » Thu Sep 24, 2020 1:03 pm

9 Replies

66765 Views

Last post by malarkey1976
Tue Sep 21, 2021 4:47 pm
PSUD improvements

Last post by IslandPink « Thu Aug 26, 2021 6:18 pm

by IslandPink » Thu Aug 26, 2021 6:18 pm

0 Replies

38121 Views

Last post by IslandPink
Thu Aug 26, 2021 6:18 pm
How can I tell if valves need replacing

Last post by steve s « Sun Aug 15, 2021 11:16 pm
Replies: 8
by bostod » Sun Jan 10, 2021 1:43 pm

8 Replies

50213 Views

Last post by steve s
Sun Aug 15, 2021 11:16 pm
CCS adjustment question

Last post by Thermionic Idler « Mon Jun 21, 2021 5:45 pm
Replies: 2
by Thermionic Idler » Mon Jun 21, 2021 1:34 pm

2 Replies

36008 Views

Last post by Thermionic Idler
Mon Jun 21, 2021 5:45 pm
Restacking An Output Transformer.

Last post by Cressy Snr « Sat May 22, 2021 12:25 pm
Replies: 60
by Cressy Snr » Tue May 11, 2021 8:40 pm
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60 Replies

193606 Views

Last post by Cressy Snr
Sat May 22, 2021 12:25 pm
Zout Maths - is it me?

Last post by Ray P « Thu Apr 15, 2021 7:20 pm
Replies: 3
by Ray P » Thu Apr 15, 2021 7:52 am

3 Replies

40380 Views

Last post by Ray P
Thu Apr 15, 2021 7:20 pm
Simple Active Low Pass Filter/Buffer

Last post by Ray P « Fri Mar 05, 2021 9:23 pm
Replies: 6
by Ray P » Thu Mar 04, 2021 10:00 pm

6 Replies

55238 Views

Last post by Ray P
Fri Mar 05, 2021 9:23 pm

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