Recent Posts

81

Legacy Products / Re: Paramour rebuild with MQ 60H choke - what size CAP?

« Last post by Paul Birkeland on March 18, 2025, 03:09:10 PM »

That is the same lamination size as the OT-2 we use in the SEX and Stereomour (bigger than what's in the tiny Speco), but not quite as large of a stack (fewer of those laminations in the stack).  I think 7uF should be just fine.

82

Crack-a-two-a / Re: A buzz in both channels

« Last post by Paul Birkeland on March 17, 2025, 06:43:17 AM »

My next repair opening is late summer (August), and I can have a look at it then.

-PB

83

Mainline / Re: 417 tube

« Last post by 2wo on March 15, 2025, 05:57:48 PM »

If you're making the adapter yourself, you might be able to add some stoppers or maybe some ferrite beads internally. Might help a little. I have only tried this on a 6sn7 adapter

84

Mainline / Re: 417 tube

« Last post by hpleung on March 15, 2025, 04:00:05 PM »

Thanks. I will try and see.

85

Mainline / Re: 417 tube

« Last post by Paul Joppa on March 15, 2025, 02:57:21 PM »

Probably. Some issues are:

* The plate impedance is a bit more than twice as high, so it won't drive low-impedance headphones quite as well

* The parafeed capacitor might need a different a different value

* Both tubes are highly prone to oscillation at very high frequencies, so lead dress is critical. It may not be possible to make an adapter that does not oscillate.

86

Mainline / 417 tube

« Last post by hpleung on March 15, 2025, 12:36:16 PM »

Hi,

I wanted to check if the 417 tube can be used on the mainline. With an adapter.

Thanks

87

Crack-a-two-a / Re: A buzz in both channels

« Last post by Skipperrik on March 15, 2025, 10:22:40 AM »

I replaced the regulators and several other components. It wasn't until I replaced the LED's that the problem was solved. The voltages are back within spec.

I still have the hum problem. I have no idea what to do at this point. Is it something you are willing to track down if I send the amp to you, and if so, how much would it cost?

Thanks.

88

Legacy Products / Re: Paramour rebuild with MQ 60H choke - what size CAP?

« Last post by CentripetalMan on March 14, 2025, 05:40:35 AM »

Hi Paul,  I've attached the photos of the transformer.

Thanks!

89

Crack-a-two-a / Re: Finally finished my curly maple wood base!

« Last post by larcenasb on March 10, 2025, 07:59:51 PM »

Thanks, Doc! Seriously love this thing!

Hi hmbscott! The color matching—believe it or not—was completely coincidental! I built the Bottlehead in 2022, and didn't think about getting a Rebel till last year. It just worked out! The paint is Rustoleum matte emerald green....I'm astonished how close the Rebel color is, it's uncanny.

90

Crack-a-two-a / Re: Finally finished my curly maple wood base!

« Last post by hmbscott on March 10, 2025, 07:55:29 PM »

Beautiful! Not a flaw, Wabi-Sabi. Color matching your Rebel head amp was a nice touch.