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Concertina with gain

Last post by revintage « Thu Jan 22, 2026 12:20 pm
Replies: 22
by revintage » Sun Jan 18, 2026 6:28 pm
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22 Replies

4079 Views

Last post by revintage
Thu Jan 22, 2026 12:20 pm
SE 813 Data using James 6123HS at 5k ohm 90 mA 750v

Last post by Paul Barker « Sun Jan 18, 2026 4:03 pm
Replies: 2
by Paul Barker » Thu Jan 15, 2026 3:30 pm

2 Replies

331 Views

Last post by Paul Barker
Sun Jan 18, 2026 4:03 pm
6pi13C known as 6P13S equivalent beam tube to EL36

Last post by Paul Barker « Tue Aug 26, 2025 2:44 pm
Replies: 14
by Paul Barker » Tue Aug 12, 2025 10:53 am

14 Replies

69187 Views

Last post by Paul Barker
Tue Aug 26, 2025 2:44 pm
PL38 cheap version of EL38

Last post by Paul Barker « Fri Jun 13, 2025 11:35 am

by Paul Barker » Fri Jun 13, 2025 11:35 am

0 Replies

58300 Views

Last post by Paul Barker
Fri Jun 13, 2025 11:35 am
GU81 Triode Connected Push Pull

Last post by Paul Barker « Mon Mar 03, 2025 6:41 pm
Replies: 19
by Paul Barker » Tue Feb 25, 2025 4:37 pm
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19 Replies

139693 Views

Last post by Paul Barker
Mon Mar 03, 2025 6:41 pm
EL33 I’ll sell this pair on eBay

Last post by Paul Barker « Thu Jan 30, 2025 12:03 pm
Replies: 7
by Paul Barker » Thu Jan 23, 2025 8:57 am

7 Replies

42148 Views

Last post by Paul Barker
Thu Jan 30, 2025 12:03 pm
6GK6 different pinout to EL84 otherwise exact same valve

Last post by jiril388 « Tue Jan 28, 2025 11:38 pm
Replies: 3
by Paul Barker » Thu Jan 23, 2025 8:32 am

3 Replies

20947 Views

Last post by jiril388
Tue Jan 28, 2025 11:38 pm
12e1

Last post by Paul Barker « Wed Jan 22, 2025 5:51 am
Replies: 7
by Paul Barker » Tue Jan 21, 2025 5:19 pm

7 Replies

29527 Views

Last post by Paul Barker
Wed Jan 22, 2025 5:51 am
Help salvaging a WD Kit6550 (or not)

Last post by Paul Barker « Thu Jan 16, 2025 7:06 am
Replies: 25
by jmc » Mon Jan 06, 2025 8:04 am
1

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25 Replies

71655 Views

Last post by Paul Barker
Thu Jan 16, 2025 7:06 am
Western Electric 300B

Last post by RhythMick « Sat Oct 26, 2024 7:20 pm
Replies: 3
by mainscablesrus » Sat Oct 26, 2024 5:47 pm

3 Replies

34939 Views

Last post by RhythMick
Sat Oct 26, 2024 7:20 pm
WAD KEL84 as power amp & Duelund cable

Last post by adrian « Tue Sep 10, 2024 3:40 pm

by adrian » Tue Sep 10, 2024 3:40 pm

0 Replies

45127 Views

Last post by adrian
Tue Sep 10, 2024 3:40 pm
Diode spreadsheet help please?

Last post by Paul Barker « Wed Aug 14, 2024 4:11 pm
Replies: 9
by Paul Barker » Wed Jan 01, 2014 9:38 pm

9 Replies

64205 Views

Last post by Paul Barker
Wed Aug 14, 2024 4:11 pm
New Transcendent pre-amp

Last post by Jwro « Mon Jun 24, 2024 6:39 pm
Replies: 5
by Ray P » Sat Aug 01, 2020 7:59 am

5 Replies

49405 Views

Last post by Jwro
Mon Jun 24, 2024 6:39 pm
Dying Rectifier?

Last post by Mike H « Tue May 21, 2024 3:39 pm
Replies: 28
by simon » Thu May 16, 2024 6:08 pm
1

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28 Replies

79575 Views

Last post by Mike H
Tue May 21, 2024 3:39 pm
Valve amplifier service

Last post by Mike H « Fri May 17, 2024 7:42 pm
Replies: 200
by bostod » Sat Apr 01, 2023 7:45 am
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200 Replies

472795 Views

Last post by Mike H
Fri May 17, 2024 7:42 pm
MAZDA AC/P4

Last post by ACPEN « Thu Apr 18, 2024 5:03 pm

by ACPEN » Thu Apr 18, 2024 5:03 pm

0 Replies

46788 Views

Last post by ACPEN
Thu Apr 18, 2024 5:03 pm
PP3521 idht

Last post by Paul Barker « Sat Feb 03, 2024 6:22 am
Replies: 95
by Paul Barker » Fri Mar 17, 2023 6:29 pm
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95 Replies

203240 Views

Last post by Paul Barker
Sat Feb 03, 2024 6:22 am
Latest 300b valves

Last post by Rexton « Fri Sep 08, 2023 8:18 pm
Replies: 19
by Rexton » Fri Aug 25, 2023 7:16 pm
1

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19 Replies

85508 Views

Last post by Rexton
Fri Sep 08, 2023 8:18 pm
Four-wire capacitors

Last post by Paul Barker « Mon Aug 14, 2023 6:32 pm
Replies: 1
by Morgan Jones » Mon Aug 14, 2023 5:19 pm

1 Replies

35142 Views

Last post by Paul Barker
Mon Aug 14, 2023 6:32 pm
Is this a Valve of some kind?

Last post by Mike H « Wed Jun 28, 2023 6:25 pm
Replies: 12
by Dave the bass » Mon Oct 04, 2021 9:29 pm

12 Replies

57178 Views

Last post by Mike H
Wed Jun 28, 2023 6:25 pm
Tube geekery to pass the time.

Last post by Boiss « Tue Jun 13, 2023 11:00 am
Replies: 28
by Cressy Snr » Wed Dec 29, 2021 12:56 pm
1

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28 Replies

86419 Views

Last post by Boiss
Tue Jun 13, 2023 11:00 am
Ed

Last post by Nick « Wed Mar 08, 2023 10:26 am
Replies: 22
by Paul Barker » Sun Mar 05, 2023 6:31 pm
1

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22 Replies

78373 Views

Last post by Nick
Wed Mar 08, 2023 10:26 am
What are the oldest affordable valves you can still buy?

Last post by steve s « Tue Feb 07, 2023 4:16 pm
Replies: 13
by Thermionic Idler » Mon Feb 06, 2023 9:59 am

13 Replies

66401 Views

Last post by steve s
Tue Feb 07, 2023 4:16 pm
Any cure for a noisy valve?

Last post by Max N « Sun Jan 22, 2023 4:59 pm
Replies: 9
by Max N » Sat Jan 14, 2023 1:26 pm

9 Replies

48545 Views

Last post by Max N
Sun Jan 22, 2023 4:59 pm
VT-127A

Last post by IslandPink « Fri Jul 01, 2022 10:34 pm

by IslandPink » Fri Jul 01, 2022 10:34 pm

0 Replies

64522 Views

Last post by IslandPink
Fri Jul 01, 2022 10:34 pm
6V6 alternatives

Last post by Paul Barker « Wed Apr 13, 2022 5:04 am
Replies: 2
by Paul Barker » Tue Apr 12, 2022 3:20 pm

2 Replies

37227 Views

Last post by Paul Barker
Wed Apr 13, 2022 5:04 am
Another cheap 300B !

Last post by IslandPink « Mon Mar 07, 2022 6:58 pm
Replies: 4
by IslandPink » Mon Mar 15, 2021 10:42 pm

4 Replies

44658 Views

Last post by IslandPink
Mon Mar 07, 2022 6:58 pm
EL82

Last post by Paul Barker « Mon Jan 24, 2022 10:57 am
Replies: 1
by Paul Barker » Mon Jan 24, 2022 10:41 am

1 Replies

34662 Views

Last post by Paul Barker
Mon Jan 24, 2022 10:57 am
1619

Last post by Paul Barker « Sun Dec 19, 2021 10:31 am
Replies: 4
by Paul Barker » Thu Dec 16, 2021 6:31 pm

4 Replies

38915 Views

Last post by Paul Barker
Sun Dec 19, 2021 10:31 am
D3a Triode Square Wave shows HF boost

Last post by Mike H « Wed Jul 28, 2021 9:29 pm
Replies: 17
by RhythMick » Fri Jul 23, 2021 9:19 pm
1

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17 Replies

76543 Views

Last post by Mike H
Wed Jul 28, 2021 9:29 pm
Class A2 - heater hum

Last post by Paul Barker « Thu Jul 22, 2021 6:34 pm
Replies: 7
by ACPEN » Thu Jul 22, 2021 10:08 am

7 Replies

42478 Views

Last post by Paul Barker
Thu Jul 22, 2021 6:34 pm
801A VT62 Power and Distortion

Last post by RhythMick « Thu Jul 15, 2021 9:16 pm
Replies: 40
by Paul Barker » Fri Apr 06, 2012 8:11 am
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40 Replies

134789 Views

Last post by RhythMick
Thu Jul 15, 2021 9:16 pm
Marconi DA100 Valves

Last post by Nick « Wed Jun 30, 2021 4:41 pm
Replies: 9
by Cal » Tue Jun 29, 2021 8:16 am

9 Replies

50953 Views

Last post by Nick
Wed Jun 30, 2021 4:41 pm
Another insane valve for phonos

Last post by Nick « Sun May 30, 2021 11:26 pm
Replies: 12
by IslandPink » Wed Jul 08, 2020 8:21 pm

12 Replies

57534 Views

Last post by Nick
Sun May 30, 2021 11:26 pm
SRPP stage useing a 5670

Last post by ruffrecords « Thu May 27, 2021 9:53 pm
Replies: 19
by acorn » Sat Oct 06, 2018 3:38 pm
1

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19 Replies

90839 Views

Last post by ruffrecords
Thu May 27, 2021 9:53 pm
Seraphim Phonostage

Last post by ruffrecords « Wed May 26, 2021 11:47 am
Replies: 7
by JohnG » Mon Feb 24, 2020 5:58 am

7 Replies

48552 Views

Last post by ruffrecords
Wed May 26, 2021 11:47 am
211

Last post by IslandPink « Tue May 11, 2021 2:59 pm
Replies: 12
by ed » Sun May 02, 2021 9:38 am

12 Replies

55321 Views

Last post by IslandPink
Tue May 11, 2021 2:59 pm
WAD 300b hum and buzz

Last post by Nick « Sun Nov 15, 2020 3:27 pm
Replies: 3
by adrian » Sat Nov 02, 2019 3:17 pm

3 Replies

46512 Views

Last post by Nick
Sun Nov 15, 2020 3:27 pm
john wood kt88 amp

Last post by jayman67 « Sun Sep 06, 2020 6:01 pm

by jayman67 » Sun Sep 06, 2020 6:01 pm

0 Replies

42323 Views

Last post by jayman67
Sun Sep 06, 2020 6:01 pm
Interesting Meters & 300B amp

Last post by RhythMick « Sun Jul 26, 2020 2:11 pm
Replies: 1
by Ray P » Sat Jul 25, 2020 10:42 pm

1 Replies

35061 Views

Last post by RhythMick
Sun Jul 26, 2020 2:11 pm
Saw these and thought of you guys...

Last post by Ali Tait « Fri Jul 17, 2020 5:50 pm
Replies: 22
by Ray P » Thu Jul 16, 2020 7:07 pm
1

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22 Replies

80468 Views

Last post by Ali Tait
Fri Jul 17, 2020 5:50 pm
Help needed on kt88 WAD amplifier

Last post by Nick « Thu Jul 02, 2020 10:20 pm
Replies: 3
by bostod » Thu Jul 02, 2020 10:32 am

3 Replies

42603 Views

Last post by Nick
Thu Jul 02, 2020 10:20 pm
6AK5 and 6AK6 anyone aware of circuits for us with?

Last post by Paul Barker « Sat Jun 27, 2020 9:48 pm
Replies: 2
by Paul Barker » Sat Jun 27, 2020 6:37 pm

2 Replies

38756 Views

Last post by Paul Barker
Sat Jun 27, 2020 9:48 pm
Cheap integrated on ebay, with MM stage. Opinions?

Last post by adrian « Thu Jun 11, 2020 12:26 pm
Replies: 7
by adrian » Tue Jun 09, 2020 2:14 pm

7 Replies

50104 Views

Last post by adrian
Thu Jun 11, 2020 12:26 pm
Tung Sol

Last post by Paul Barker « Mon Jun 08, 2020 9:21 pm
Replies: 6
by Baggy Trousers » Mon Jun 08, 2020 9:53 am

6 Replies

46682 Views

Last post by Paul Barker
Mon Jun 08, 2020 9:21 pm
CV315/4304CB/VT62 - RAF Transmitter

Last post by pre65 « Wed Apr 08, 2020 1:08 pm
Replies: 25
by Cressy Snr » Sun Mar 07, 2010 4:35 pm
1

2
25 Replies

99488 Views

Last post by pre65
Wed Apr 08, 2020 1:08 pm
Beard P101 amplifier.

Last post by Mike H « Thu Feb 06, 2020 8:39 pm
Replies: 14
by Chopsaw » Sun Feb 02, 2020 1:24 pm

14 Replies

80008 Views

Last post by Mike H
Thu Feb 06, 2020 8:39 pm
uTracer v6

Last post by jack « Sat Jan 04, 2020 4:59 pm

by jack » Sat Jan 04, 2020 4:59 pm

0 Replies

37477 Views

Last post by jack
Sat Jan 04, 2020 4:59 pm
Valve Tester

Last post by little eddy « Tue Nov 12, 2019 2:44 pm
Replies: 2
by little eddy » Mon Nov 11, 2019 4:12 pm

2 Replies

39347 Views

Last post by little eddy
Tue Nov 12, 2019 2:44 pm
TAD KT88-STR

Last post by Qwin « Wed Nov 06, 2019 4:54 pm

by Qwin » Wed Nov 06, 2019 4:54 pm

0 Replies

37492 Views

Last post by Qwin
Wed Nov 06, 2019 4:54 pm

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