Looking for a Gulbransen Rialto K user manual

[pedropol]

Hello,

I'm looking for the user manual for a Gulbransen Rialto K, the model with only one Leslie 101, preferably as a PDF. Any hint where I could find that?

Thanks in advance.
--
Pierre

[Jan Girardot]

Pierre, your manual will be mailed tomorrow at the latest. I believe it will answer most if not all your questions; Jimmy Williams and I can answer any others here on the Forrum.

. . . Jan

[pedropol]

Where are the tremolos switches?

Thanks Jan,

According to the Leslie 101 manual (,http://www.captain-foldback.com/Lesl...nuals/L101.pdf) the circuits for the rotating speakers are activated when the tibia tremolo or the main tremolo switches are on. Can you explain me where these tremolo switches are located?

Thanks

[Jan Girardot]

I think you have a Model 1107 (no Piano, a GK-100 Leslie) right? To be sure, check the organ's model/serial number plate up under the keyboard deck toward the left end.

In the center of the stop rail, above the GULBRANSEN name plate, there will be two tabs, Main tremulant and Tibia tremulant. The Main trem. tab applies a varying voltage to the 12 top-octave Main tone generators, shifting their pitch sharp and flat at a regular rate. The Tibia Tremulant controls the signal from the main power amplifier and switches this signal between a stationary speaker for Tremolo “off” and a rotating speaker for Tremolo “on”. The Main trem. tab applies a varying voltage to the 12 top-octave Main tone generators, shifting their pitch sharp and flat at a regular rate. Notice that Tibia voices are lettered in gold, while all other voices are in black or white.

. . .Jan

[pedropol]

Model numbers

Hello Jan,

According to the pictures I posted on http://www.organforum.com/forums/sho...should-I-start, it reads:
- Gulbransen: Serial # 26781; Model K; 135 Watts
- Leslie Isomonic Model 101, Serial # 2048, 220 Watts 2.3 Amps

So I read the Leslie 101 manual. I haven't had the chance to work on it yet and open the casing and check if it matches the schematics in the manual.

Like I said in another post, the letters in the tabs has faded out, particularly those engraved in the black keys and in the wood, and that's not easy to find their role. In fact, I'm missing a map of the keyboards. I'm waiting for your book: probably that I'll find the information into it. I'll try toning to find these tabs and see if they work.

Thanks
--
Pierre

[Doddy.van.Straaten]

Gulbransen Rialto 'K' stop layout (without Piano)

Hello Pierre,

Keep going buddy, if you want to know what the Rialto K sounds like when you have fixed it up, try these links . . .
http://www.theatreorgans.com/walnuthill/archive0607.htm
http://www.theatreorgans.com/walnuth...kennedy_04.wma

Or these videos . . .
https://www.youtube.com/watch?v=GFWxpEWKpoo

Or the more prolific producer of Rialto K videos by Gary Smith.
https://www.youtube.com/channel/UC2a...fBMYpVO9j7sNgA


STOPTAB LAYOUT:

It took me a bit of rummaging about but the link to The Bone Doc's (Richard Mogridge) Walnut Hill website saved the day. This list 'appears' to show the stop tab layout of your model of Rialto K without the Piano.



The gold letters on the bolster define the use of the various pistons . . . Primarily associated with the Rialto's 'Omega' percussion circuitry.

• OMEGA CANCEL
• REVERB
• PERCUSSION SHORT
• PERCUSSION LONG (x 2)
• CHIME SOLO
• SFORZANDO

Photos of Charles Fultz's Kennedy Meadows, CA Rialto K can be found here . . . http://www.theatreorgans.com/walnuthill/archive0607.htm Just click on any of the Rialto's photos and they will direct you to much larger versions for your studies.


The stops appear to be self evident (but not if the words have been rubbed off!) nomenclatures for loudness (VOL) and brightness (BRI) controls, the Tremulants for MAIN and TIBIA's are separated, but you will find when reading the Leslie 101 manual that there are two channels of audio for the MAIN voices (I.e; any voices other than Tibia's).

Thus:

1. Amplifier Channel No#1 - Organ Pedal Channel
2. Amplifier Channel No#2 - Organ MAIN 'C' Channel
3. Amplifier Channel No#3 - Organ MAIN 'C#' Channel
4. Amplifier Channel No#4 - Organ TIBIA Channel

When you look at page 7 of the Leslie 101 manual you can see how the switching takes place between rotary speakers and the three 6x9" speakers in the front of the cabinet. The two controls on the TREMS panel of the console make the change between the two.

ISOMONIC AUDIO:
The use of C and C# on the MAIN voices is due to the fact that all MAIN voicing is split at every other note and sent to two individual channels of audio and two different speakers in the 101's rotary drum, and the 6x9's. TIBIA's do not require this air-mixing and use a single channel of audio and a single 6x9" speaker in the 101's drum and a fixed 6x9" in the front of the cabinet.

Hope this all helps for now? I'd appreciate your feedback on the stoptab list matching your organ - just for my records.

[pedropol]

Hello Doddy,

Thank you very much with the tab layout and all the links. I'm going to check tonight if it matches with my organ and I will identify the missing words. I'll report tomorrow if that's the layout I have. Later I'll have to find a way to restore the engraving in the keys, but that's another story...

Also, I've seen on the pictures from the link that you provided that I can read the prints on the wood for the white buttons between the two keyboards. Some of these buttons on my organ don't work and get stuck. It will help me identify what's the usage of these buttons.
--
Pierre

[pedropol]

Stop tongues layout

Hello Doddy,

Your stop tongues layout help me a lot understanding my model K. There are a few differences though:

• In the ACCOMPANIMENT group, the white "Tibia Minor 1 1/3' TIBIA" stop reads in fact "Tibia Minor 1 3/5' TIBIA" like on Walnut Hill picture.
• In the TREMULANTS group, I have one more white stop tongue at the left of the group named "Main Tremulant Chorus TREM". So there are 3 TREM stops.
• The group BRIGHTNESS is in fact named TIBIA VOICING like on Walnut Hill site pictures.
• In the SOLO group, the red stop "Contra Tuba 9' TUBA" is labeled "Electro Mute 8' TUBA".
• In the SOLO group, the white stop "Tibia Major 1 2/3' TIBIA" is in fact "Tibia Major 1 3/5'" like on the picture.

There's also a difference in the pistons, as compared with the picture on Walnut Hill site:

• The second PERCUSSION LONG piston, on the right, is labeled PRESET LONG on mine.

On mine, it was impossible to read the OMEGA CANCEL one because the text was partially erased.

Compared with the Rialto pictured on the Walnut Hill site, mine has only one Leslie speaker and from what I understand is an older model.


One more thing, what does it mean "without Piano" in Rialto K (without Piano)"?

Thanks
--
Pierre

[Doddy.van.Straaten]

Thanks Pierre,

That is very interesting information, it looks like a third variation of the Rialto K exists with your instrument then. I'll be cross checking and documenting your information later. Thank you very much for the feedback.

Historically the Rialto K was also designed at some later stage than your instrument to operate with a pair of Leslie speakers, the famed Leslie 102 and Leslie 103, and earlier Rialto K versions worked with the Leslie GK100 prior to your Leslie 101.


Other later versions of the Rialto also had a Piano stop, different voices for the Pedal division and different Tremulant controls again aka:

You can't miss it! It is the green stoptab on the top right hand side.

[pedropol]

Lot of information in the Gulbransen Rialto K book

Hello Jan,

I've received your Rialto K book tonight. There's a lot of information for the specialist organist/electronician in it. I'll have to read it multiple times to understand the vocabulary and experiment on my organ to confirm practice with theory in the book. I'm still missing an electronic organ/Rialto 101 manual to understand the basis, but I'm learning from this forum and I'll complete with your book.

Thanks

[pedropol]

To complete the story...

Hello,

To terminate that thread, George Reynertson from Dave's Electronic was very kind to send me an electronic copy of the Rialto User Manual for model 1107 K. At least now I've a better understanding of what to expect from the tabs combinations.

Also, he explained me why my organ was different from the models discussed in this thread. Here it is for posterity:

Your organ was built sometime between 1959 to early 1965. In early 1965 the 1135 model started.

I started working for Gulbransen in August 1965 and began testing the Model K in late 1965. Production was stopped sometime in 1967. The major differences between the 2 models was the addition of the electronic piano, waa-waa lever on the Solo Tuba stop, both being optional and the multi-speaker set up. The Leslie 102 and 103 speakers was the best.

You do have an 1107 but had I forgotten the correct name with the 101 cabinet is, 1107-101.

The Tremolo tab board circuitry for the 101 is different from the GK100. If I remember correctly, the original board was goobered to be used with the 101. With the 101

speaker you have both main vibrato AND Tremolo functions.

The grey box is for headphones. Mono, not stereo though. No headphone jack in the 1135.

It's possible that the company started offering the Electro-Mute before the 1135 was introduced in early 1965. Before my time.

Thanks again George!
--
Pierre Métras