Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: johngovan on November 21, 2021, 07:10:22 am

Title: Tone King Imperial PI Question
Post by: johngovan on November 21, 2021, 07:10:22 am

What kind of phase inverter does tone king Imperial use?

I'm planning to make one soon.

Thank you.

Title: Re: Tone King Imperial PI Question
Post by: sluckey on November 21, 2021, 08:43:51 am

paraphase inverter

Title: Re: Tone King Imperial PI Question
Post by: Bieworm on November 21, 2021, 03:19:55 pm

FWIW that's the first thing I changed on my clone. The LTP PI is so much better in it. The volume is uncontroleable with the paraphase

I found the OD channel useless too without the dedicated attenuator.  It's too loud when you want OD

Title: Re: Tone King Imperial PI Question
Post by: PRR on November 21, 2021, 08:13:19 pm

https://el34world.com/Forum/index.php?topic=28215.msg310775#msg310775

Title: Re: Tone King Imperial PI Question
Post by: johngovan on November 21, 2021, 09:09:36 pm

Thank you sluckey, Bieworm and PRR. Really appreciate your responses.

Title: Re: Tone King Imperial PI Question
Post by: johngovan on November 21, 2021, 11:58:46 pm

Another question. How to identify types of resistor?

Beige color = carbon resistor?
Blue color = metal film resistor?
White color = cement resistor.
Green color = wire wound resistor?
Gray color = ?

Thank you.

Title: Re: Tone King Imperial PI Question
Post by: shooter on November 22, 2021, 02:27:19 am

Bad Boys Race Our Young Girls.......?
black brown red orange green.....?
surf up "resistor color codes"

Title: Re: Tone King Imperial PI Question
Post by: johngovan on November 22, 2021, 02:43:33 am

Quote from: shooter on November 22, 2021, 02:27:19 am

Bad Boys Race Our Young Girls.......?
black brown red orange green.....?
surf up "resistor color codes"

Thanks shooter for the response. But I'm not after the code but for the type of resistors. How can you identify if that resistor is a carbon film, a metal film, or a metal oxide?

Title: Re: Tone King Imperial PI Question
Post by: acheld on November 22, 2021, 09:36:59 am

Quote

How can you identify if that resistor is a carbon film, a metal film, or a metal oxide?

Don't take this as gospel, but I don't think you can reliably ID a resistor type from the casing.   You can guess, and be right most of the time.   

For example, many modern metal film resistors have a blue epoxy casing; Vishay Dale MF resistors, mostly come in a brown excremental looking casing (these are my personal favorites, esp the MILSPEC variety), but they also have some MF resistors in a chalky orange casing that you would swear would be a metal oxide with a flame proof casing.

So, for modern resistors, I don't think you can generalize.

Title: Re: Tone King Imperial PI Question
Post by: johngovan on November 22, 2021, 05:24:41 pm

Quote from: acheld on November 22, 2021, 09:36:59 am

Quote

How can you identify if that resistor is a carbon film, a metal film, or a metal oxide?

Don't take this as gospel, but I don't think you can reliably ID a resistor type from the casing.   You can guess, and be right most of the time.   

For example, many modern metal film resistors have a blue epoxy casing; Vishay Dale MF resistors, mostly come in a brown excremental looking casing (these are my personal favorites, esp the MILSPEC variety), but they also have some MF resistors in a chalky orange casing that you would swear would be a metal oxide with a flame proof casing.

So, for modern resistors, I don't think you can generalize.

Thank you for the help acheld. It is very clear. Appreciate it.